How to use singleElement method of org.assertj.core.api.AbstractIterableAssert class

Best Assertj code snippet using org.assertj.core.api.AbstractIterableAssert.singleElement

Source:AssertJAssertions.java

...1201 public AbstractAssert last() { return (AbstractAssert) (Object) null; }1202 public AbstractAssert last(InstanceOfAssertFactory p0) { return (AbstractAssert) (Object) null; }1203 public AbstractAssert element(int p0) { return (AbstractAssert) (Object) null; }1204 public AbstractAssert element(int p0, InstanceOfAssertFactory p1) { return (AbstractAssert) (Object) null; }1205 public AbstractAssert singleElement() { return (AbstractAssert) (Object) null; }1206 public AbstractAssert singleElement(InstanceOfAssertFactory p0) { return (AbstractAssert) (Object) null; }1207 public AbstractIterableAssert filteredOn(java.util.function.Predicate p0) { return (AbstractIterableAssert) (Object) null; }1208 public AbstractIterableAssert allMatch(java.util.function.Predicate p0) { return (AbstractIterableAssert) (Object) null; }1209 public AbstractIterableAssert allMatch(java.util.function.Predicate p0, String p1) { return (AbstractIterableAssert) (Object) null; }1210 public AbstractIterableAssert allSatisfy(java.util.function.Consumer p0) { return (AbstractIterableAssert) (Object) null; }1211 public AbstractIterableAssert anyMatch(java.util.function.Predicate p0) { return (AbstractIterableAssert) (Object) null; }1212 public AbstractIterableAssert zipSatisfy(Iterable p0, java.util.function.BiConsumer p1) { return (AbstractIterableAssert) (Object) null; }1213 public AbstractIterableAssert anySatisfy(java.util.function.Consumer p0) { return (AbstractIterableAssert) (Object) null; }1214 public AbstractIterableAssert noneSatisfy(java.util.function.Consumer p0) { return (AbstractIterableAssert) (Object) null; }1215 public AbstractIterableAssert satisfiesExactly(java.util.function.Consumer[] p0) { return (AbstractIterableAssert) (Object) null; }1216 public AbstractIterableAssert satisfiesExactlyInAnyOrder(java.util.function.Consumer[] p0) { return (AbstractIterableAssert) (Object) null; }1217 public AbstractIterableAssert as(String p0, Object[] p1) { return (AbstractIterableAssert) (Object) null; }1218 public AbstractIterableAssert as(org.assertj.core.description.Description p0) { return (AbstractIterableAssert) (Object) null; }1219 public AbstractIterableAssert describedAs(org.assertj.core.description.Description p0) { return (AbstractIterableAssert) (Object) null; }1220 public AbstractIterableAssert describedAs(String p0, Object[] p1) { return (AbstractIterableAssert) (Object) null; }...

Source:AbstractIterableAssert.java

...294 * @throws AssertionError if the {@link Iterable} does not have a unique element.295 * @throws AssertionError if the {@link Iterable}'s unique element does not satisfy the given assertions.296 *297 * @since 3.5.0298 * @deprecated use {@link #singleElement()} instead299 */300 @Deprecated301 @Override302 public SELF hasOnlyOneElementSatisfying(Consumer<? super ELEMENT> elementAssertions) {303 iterables.assertHasSize(info, actual, 1);304 elementAssertions.accept(actual.iterator().next());305 return myself;306 }307 /**308 * {@inheritDoc}309 */310 @Override311 public SELF hasSameSizeAs(Object other) {312 iterables.assertHasSameSizeAs(info, actual, other);313 return myself;314 }315 /**316 * {@inheritDoc}317 */318 @Override319 public SELF hasSameSizeAs(Iterable<?> other) {320 iterables.assertHasSameSizeAs(info, actual, other);321 return myself;322 }323 /**324 * {@inheritDoc}325 */326 @Override327 public SELF contains(@SuppressWarnings("unchecked") ELEMENT... values) {328 iterables.assertContains(info, actual, values);329 return myself;330 }331 /**332 * {@inheritDoc}333 */334 @Override335 public SELF containsOnly(@SuppressWarnings("unchecked") ELEMENT... values) {336 iterables.assertContainsOnly(info, actual, values);337 return myself;338 }339 /**340 * {@inheritDoc}341 */342 @Override343 public SELF containsOnlyOnce(@SuppressWarnings("unchecked") ELEMENT... values) {344 iterables.assertContainsOnlyOnce(info, actual, values);345 return myself;346 }347 /**348 * {@inheritDoc}349 */350 @Override351 public SELF containsOnlyNulls() {352 iterables.assertContainsOnlyNulls(info, actual);353 return myself;354 }355 /**356 * {@inheritDoc}357 */358 @Override359 public SELF containsExactly(@SuppressWarnings("unchecked") ELEMENT... values) {360 iterables.assertContainsExactly(info, actual, values);361 return myself;362 }363 /** {@inheritDoc} */364 @Override365 public SELF containsExactlyInAnyOrder(@SuppressWarnings("unchecked") ELEMENT... values) {366 iterables.assertContainsExactlyInAnyOrder(info, actual, values);367 return myself;368 }369 /**370 * {@inheritDoc}371 */372 @Override373 public SELF containsExactlyInAnyOrderElementsOf(Iterable<? extends ELEMENT> values) {374 return containsExactlyInAnyOrder(toArray(values));375 }376 /**377 * {@inheritDoc}378 */379 @Override380 public SELF isSubsetOf(Iterable<? extends ELEMENT> values) {381 iterables.assertIsSubsetOf(info, actual, values);382 return myself;383 }384 /**385 * {@inheritDoc}386 */387 @Override388 public SELF isSubsetOf(@SuppressWarnings("unchecked") ELEMENT... values) {389 iterables.assertIsSubsetOf(info, actual, Arrays.asList(values));390 return myself;391 }392 /**393 * {@inheritDoc}394 */395 @Override396 public SELF containsSequence(@SuppressWarnings("unchecked") ELEMENT... sequence) {397 iterables.assertContainsSequence(info, actual, sequence);398 return myself;399 }400 /**401 * {@inheritDoc}402 */403 @Override404 public SELF containsSequence(Iterable<? extends ELEMENT> sequence) {405 checkSequenceIsNotNull(sequence);406 iterables.assertContainsSequence(info, actual, toArray(sequence));407 return myself;408 }409 /**410 * {@inheritDoc}411 */412 @Override413 public SELF doesNotContainSequence(@SuppressWarnings("unchecked") ELEMENT... sequence) {414 iterables.assertDoesNotContainSequence(info, actual, sequence);415 return myself;416 }417 /**418 * {@inheritDoc}419 */420 @Override421 public SELF doesNotContainSequence(Iterable<? extends ELEMENT> sequence) {422 checkSequenceIsNotNull(sequence);423 iterables.assertDoesNotContainSequence(info, actual, toArray(sequence));424 return myself;425 }426 /**427 * {@inheritDoc}428 */429 @Override430 public SELF containsSubsequence(@SuppressWarnings("unchecked") ELEMENT... subsequence) {431 iterables.assertContainsSubsequence(info, actual, subsequence);432 return myself;433 }434 /**435 * {@inheritDoc}436 */437 @Override438 public SELF containsSubsequence(Iterable<? extends ELEMENT> subsequence) {439 checkSubsequenceIsNotNull(subsequence);440 iterables.assertContainsSubsequence(info, actual, toArray(subsequence));441 return myself;442 }443 /**444 * {@inheritDoc}445 */446 @Override447 public SELF doesNotContainSubsequence(@SuppressWarnings("unchecked") ELEMENT... subsequence) {448 iterables.assertDoesNotContainSubsequence(info, actual, subsequence);449 return myself;450 }451 /**452 * {@inheritDoc}453 */454 @Override455 public SELF doesNotContainSubsequence(Iterable<? extends ELEMENT> subsequence) {456 checkSubsequenceIsNotNull(subsequence);457 iterables.assertDoesNotContainSubsequence(info, actual, toArray(subsequence));458 return myself;459 }460 @Override461 public SELF doesNotContain(@SuppressWarnings("unchecked") ELEMENT... values) {462 iterables.assertDoesNotContain(info, actual, values);463 return myself;464 }465 @Override466 public SELF doesNotContainAnyElementsOf(Iterable<? extends ELEMENT> iterable) {467 iterables.assertDoesNotContainAnyElementsOf(info, actual, iterable);468 return myself;469 }470 /**471 * {@inheritDoc}472 */473 @Override474 public SELF doesNotHaveDuplicates() {475 iterables.assertDoesNotHaveDuplicates(info, actual);476 return myself;477 }478 /**479 * {@inheritDoc}480 */481 @Override482 public SELF startsWith(@SuppressWarnings("unchecked") ELEMENT... sequence) {483 iterables.assertStartsWith(info, actual, sequence);484 return myself;485 }486 /**487 * {@inheritDoc}488 */489 @Override490 public SELF endsWith(ELEMENT first, @SuppressWarnings("unchecked") ELEMENT... rest) {491 iterables.assertEndsWith(info, actual, first, rest);492 return myself;493 }494 /**495 * {@inheritDoc}496 */497 @Override498 public SELF endsWith(ELEMENT[] sequence) {499 iterables.assertEndsWith(info, actual, sequence);500 return myself;501 }502 /**503 * {@inheritDoc}504 */505 @Override506 public SELF containsNull() {507 iterables.assertContainsNull(info, actual);508 return myself;509 }510 /**511 * {@inheritDoc}512 */513 @Override514 public SELF doesNotContainNull() {515 iterables.assertDoesNotContainNull(info, actual);516 return myself;517 }518 /**519 * {@inheritDoc}520 */521 @Override522 public SELF are(Condition<? super ELEMENT> condition) {523 iterables.assertAre(info, actual, condition);524 return myself;525 }526 /**527 * {@inheritDoc}528 */529 @Override530 public SELF areNot(Condition<? super ELEMENT> condition) {531 iterables.assertAreNot(info, actual, condition);532 return myself;533 }534 /**535 * {@inheritDoc}536 */537 @Override538 public SELF have(Condition<? super ELEMENT> condition) {539 iterables.assertHave(info, actual, condition);540 return myself;541 }542 /**543 * {@inheritDoc}544 */545 @Override546 public SELF doNotHave(Condition<? super ELEMENT> condition) {547 iterables.assertDoNotHave(info, actual, condition);548 return myself;549 }550 /**551 * {@inheritDoc}552 */553 @Override554 public SELF areAtLeastOne(Condition<? super ELEMENT> condition) {555 areAtLeast(1, condition);556 return myself;557 }558 /**559 * {@inheritDoc}560 */561 @Override562 public SELF areAtLeast(int times, Condition<? super ELEMENT> condition) {563 iterables.assertAreAtLeast(info, actual, times, condition);564 return myself;565 }566 /**567 * {@inheritDoc}568 */569 @Override570 public SELF areAtMost(int times, Condition<? super ELEMENT> condition) {571 iterables.assertAreAtMost(info, actual, times, condition);572 return myself;573 }574 /**575 * {@inheritDoc}576 */577 @Override578 public SELF areExactly(int times, Condition<? super ELEMENT> condition) {579 iterables.assertAreExactly(info, actual, times, condition);580 return myself;581 }582 /** {@inheritDoc} */583 @Override584 public SELF haveAtLeastOne(Condition<? super ELEMENT> condition) {585 return haveAtLeast(1, condition);586 }587 /**588 * {@inheritDoc}589 */590 @Override591 public SELF haveAtLeast(int times, Condition<? super ELEMENT> condition) {592 iterables.assertHaveAtLeast(info, actual, times, condition);593 return myself;594 }595 /**596 * {@inheritDoc}597 */598 @Override599 public SELF haveAtMost(int times, Condition<? super ELEMENT> condition) {600 iterables.assertHaveAtMost(info, actual, times, condition);601 return myself;602 }603 /**604 * {@inheritDoc}605 */606 @Override607 public SELF haveExactly(int times, Condition<? super ELEMENT> condition) {608 iterables.assertHaveExactly(info, actual, times, condition);609 return myself;610 }611 /**612 * Verifies that at least one element in the actual {@code Iterable} has the specified type (matching includes613 * subclasses of the given type).614 * <p>615 * Example:616 * <pre><code class='java'> List&lt;Number&gt; numbers = new ArrayList&lt;Number&gt;();617 * numbers.add(1);618 * numbers.add(2L);619 *620 * // successful assertion:621 * assertThat(numbers).hasAtLeastOneElementOfType(Long.class);622 *623 * // assertion failure:624 * assertThat(numbers).hasAtLeastOneElementOfType(Float.class);</code></pre>625 *626 * @param expectedType the expected type.627 * @return this assertion object.628 * @throws NullPointerException if the given type is {@code null}.629 * @throws AssertionError if the actual {@code Object} group does not have any elements of the given type.630 */631 @Override632 public SELF hasAtLeastOneElementOfType(Class<?> expectedType) {633 // reuse code from object arrays as the logic is the same634 // (ok since this assertion doesn't rely on a comparison strategy)635 ObjectArrays.instance().assertHasAtLeastOneElementOfType(info, toArray(actual), expectedType);636 return myself;637 }638 /**639 * Verifies that all elements in the actual {@code Iterable} have the specified type (matching includes640 * subclasses of the given type).641 * <p>642 * Example:643 * <pre><code class='java'> List&lt;Number&gt; numbers = new ArrayList&lt;Number&gt;();644 * numbers.add(1);645 * numbers.add(2);646 * numbers.add(3);647 *648 * // successful assertions:649 * assertThat(numbers).hasOnlyElementsOfType(Number.class);650 * assertThat(numbers).hasOnlyElementsOfType(Integer.class);651 *652 * // assertion failure:653 * assertThat(numbers).hasOnlyElementsOfType(Long.class);</code></pre>654 *655 * @param expectedType the expected type.656 * @return this assertion object.657 * @throws NullPointerException if the given type is {@code null}.658 * @throws AssertionError if one element is not of the expected type.659 */660 @Override661 public SELF hasOnlyElementsOfType(Class<?> expectedType) {662 // reuse code from object arrays as the logic is the same663 // (ok since this assertion doesn't rely on a comparison strategy)664 ObjectArrays.instance().assertHasOnlyElementsOfType(info, toArray(actual), expectedType);665 return myself;666 }667 /**668 * Verifies that all elements in the actual {@code Iterable} do not have the specified types (including subclasses).669 * <p>670 * Example:671 * <pre><code class='java'> List&lt;Number&gt; numbers = new ArrayList&lt;&gt;();672 * numbers.add(1);673 * numbers.add(2);674 * numbers.add(3.0);675 *676 * // successful assertions:677 * assertThat(numbers).doesNotHaveAnyElementsOfTypes(Long.class, Float.class);678 *679 * // assertion failure:680 * assertThat(numbers).doesNotHaveAnyElementsOfTypes(Long.class, Integer.class);</code></pre>681 *682 * @param unexpectedTypes the not expected types.683 * @return this assertion object.684 * @throws NullPointerException if the given type is {@code null}.685 * @throws AssertionError if one element's type matches the given types.686 * @since 2.9.0 / 3.9.0687 */688 @Override689 public SELF doesNotHaveAnyElementsOfTypes(Class<?>... unexpectedTypes) {690 ObjectArrays.instance().assertDoesNotHaveAnyElementsOfTypes(info, toArray(actual), unexpectedTypes);691 return myself;692 }693 /** {@inheritDoc} */694 @Override695 public SELF hasOnlyElementsOfTypes(Class<?>... types) {696 ObjectArrays.instance().assertHasOnlyElementsOfTypes(info, toArray(actual), types);697 return myself;698 }699 /**700 * {@inheritDoc}701 */702 @Override703 public SELF containsAll(Iterable<? extends ELEMENT> iterable) {704 iterables.assertContainsAll(info, actual, iterable);705 return myself;706 }707 /**708 * {@inheritDoc}709 */710 @Override711 @CheckReturnValue712 public SELF usingElementComparator(Comparator<? super ELEMENT> elementComparator) {713 this.iterables = new Iterables(new ComparatorBasedComparisonStrategy(elementComparator));714 // to have the same semantics on base assertions like isEqualTo, we need to use an iterable comparator comparing715 // elements with elementComparator parameter716 objects = new Objects(new IterableElementComparisonStrategy<>(elementComparator));717 return myself;718 }719 @CheckReturnValue720 private SELF usingExtendedByTypesElementComparator(Comparator<Object> elementComparator) {721 return usingElementComparator(new ExtendedByTypesComparator(elementComparator, getComparatorsByType()));722 }723 /**724 * {@inheritDoc}725 */726 @Override727 @CheckReturnValue728 public SELF usingDefaultElementComparator() {729 this.iterables = Iterables.instance();730 return usingDefaultComparator();731 }732 /**733 * Verifies that the actual {@link Iterable} contains at least one of the given values.734 * <p>735 * Example :736 * <pre><code class='java'> Iterable&lt;String&gt; abc = Arrays.asList("a", "b", "c");737 *738 * // assertions will pass739 * assertThat(abc).containsAnyOf("b")740 * .containsAnyOf("b", "c")741 * .containsAnyOf("a", "b", "c")742 * .containsAnyOf("a", "b", "c", "d")743 * .containsAnyOf("e", "f", "g", "b");744 *745 * // assertions will fail746 * assertThat(abc).containsAnyOf("d");747 * assertThat(abc).containsAnyOf("d", "e", "f", "g");</code></pre>748 *749 * @param values the values whose at least one which is expected to be in the {@code Iterable} under test.750 * @return {@code this} assertion object.751 * @throws NullPointerException if the array of values is {@code null}.752 * @throws IllegalArgumentException if the array of values is empty and the {@code Iterable} under test is not empty.753 * @throws AssertionError if the {@code Iterable} under test is {@code null}.754 * @throws AssertionError if the {@code Iterable} under test does not contain any of the given {@code values}.755 * @since 2.9.0 / 3.9.0756 */757 @Override758 public SELF containsAnyOf(@SuppressWarnings("unchecked") ELEMENT... values) {759 iterables.assertContainsAnyOf(info, actual, values);760 return myself;761 }762 /**763 * Verifies that the {@link Iterable} under test contains at least one of the given {@link Iterable} elements.764 * <p>765 * Example :766 * <pre><code class='java'> Iterable&lt;String&gt; abc = Arrays.asList("a", "b", "c");767 *768 * // assertions will pass769 * assertThat(abc).containsAnyElementsOf(Arrays.asList("b"))770 * .containsAnyElementsOf(Arrays.asList("b", "c"))771 * .containsAnyElementsOf(Arrays.asList("a", "b", "c"))772 * .containsAnyElementsOf(Arrays.asList("a", "b", "c", "d"))773 * .containsAnyElementsOf(Arrays.asList("e", "f", "g", "b"));774 *775 * // assertions will fail776 * assertThat(abc).containsAnyElementsOf(Arrays.asList("d"));777 * assertThat(abc).containsAnyElementsOf(Arrays.asList("d", "e", "f", "g"));</code></pre>778 *779 * @param iterable the iterable whose at least one element is expected to be in the {@code Iterable} under test.780 * @return {@code this} assertion object.781 * @throws NullPointerException if the iterable of expected values is {@code null}.782 * @throws IllegalArgumentException if the iterable of expected values is empty and the {@code Iterable} under test is not empty.783 * @throws AssertionError if the {@code Iterable} under test is {@code null}.784 * @throws AssertionError if the {@code Iterable} under test does not contain any of elements from the given {@code Iterable}.785 * @since 2.9.0 / 3.9.0786 */787 @Override788 public SELF containsAnyElementsOf(Iterable<? extends ELEMENT> iterable) {789 return containsAnyOf(toArray(iterable));790 }791 /**792 * Extract the values of the given field or property from the Iterable's elements under test into a new Iterable, this new793 * Iterable becoming the Iterable under test.794 * <p>795 * It allows you to test a property/field of the Iterable's elements instead of testing the elements themselves, which796 * can be be much less work !797 * <p>798 * Let's take a look at an example to make things clearer :799 * <pre><code class='java'> // build a list of TolkienCharacters: a TolkienCharacter has a name, and age and a Race (a specific class)800 * // they can be public field or properties, both can be extracted.801 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();802 *803 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));804 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));805 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));806 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));807 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));808 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));809 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);810 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));811 *812 * // let's verify the names of the TolkienCharacters in fellowshipOfTheRing :813 *814 * assertThat(fellowshipOfTheRing).extracting(&quot;name&quot;)815 * .contains(&quot;Boromir&quot;, &quot;Gandalf&quot;, &quot;Frodo&quot;)816 * .doesNotContain(&quot;Sauron&quot;, &quot;Elrond&quot;);817 *818 * // you can extract nested properties/fields like the name of the race :819 *820 * assertThat(fellowshipOfTheRing).extracting(&quot;race.name&quot;)821 * .contains(&quot;Hobbit&quot;, &quot;Elf&quot;)822 * .doesNotContain(&quot;Orc&quot;);</code></pre>823 * <p>824 * A property with the given name is searched for first. If it doesn't exist a field with the given name is looked825 * for. If the field does not exist an {@link IntrospectionError} is thrown. By default private fields are read but826 * you can change this with {@link Assertions#setAllowComparingPrivateFields(boolean)}. Trying to read a private field827 * when it's not allowed leads to an {@link IntrospectionError}.828 * <p>829 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under830 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted values831 * order.832 * <hr>833 * <p>834 * Extracting also support maps, that is, instead of extracting values from an Object, it extracts maps values835 * corresponding to the given keys.836 * <p>837 * Example:838 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);839 * Employee luke = new Employee(2L, new Name("Luke"), 22);840 * Employee han = new Employee(3L, new Name("Han"), 31);841 *842 * // build two maps843 * Map&lt;String, Employee&gt; map1 = new HashMap&lt;&gt;();844 * map1.put("key1", yoda);845 * map1.put("key2", luke);846 *847 * Map&lt;String, Employee&gt; map2 = new HashMap&lt;&gt;();848 * map2.put("key1", yoda);849 * map2.put("key2", han);850 *851 * // instead of a list of objects, we have a list of maps852 * List&lt;Map&lt;String, Employee&gt;&gt; maps = asList(map1, map2);853 *854 * // extracting a property in that case = get values from maps using the property as a key855 * assertThat(maps).extracting("key2").containsExactly(luke, han);856 * assertThat(maps).extracting("key1").containsExactly(yoda, yoda);857 *858 * // type safe version859 * assertThat(maps).extracting(key2, Employee.class).containsExactly(luke, han);860 *861 * // it works with several keys, extracted values being wrapped in a Tuple862 * assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));863 *864 * // unknown keys leads to null (map behavior)865 * assertThat(maps).extracting("bad key").containsExactly(null, null);</code></pre>866 *867 * @param propertyOrField the property/field to extract from the elements of the Iterable under test868 * @return a new assertion object whose object under test is the list of extracted property/field values.869 * @throws IntrospectionError if no field or property exists with the given name in one of the initial870 * Iterable's element.871 */872 @CheckReturnValue873 public AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> extracting(String propertyOrField) {874 List<Object> values = FieldsOrPropertiesExtractor.extract(actual, byName(propertyOrField));875 String extractedDescription = extractedDescriptionOf(propertyOrField);876 String description = mostRelevantDescription(info.description(), extractedDescription);877 return newListAssertInstanceForMethodsChangingElementType(values).as(description);878 }879 /**880 * Extract the result of given method invocation on the Iterable's elements under test into a new Iterable, this new881 * Iterable becoming the Iterable under test.882 * <p>883 * It allows you to test the method results of the Iterable's elements instead of testing the elements themselves. This884 * is especially useful for classes that do not conform to the Java Bean's getter specification (i.e. public String885 * toString() or public String status() instead of public String getStatus()).886 * <p>887 * Let's take a look at an example to make things clearer :888 * <pre><code class='java'> // Build a array of WesterosHouse, a WesterosHouse has a method: public String sayTheWords()889 *890 * List&lt;WesterosHouse&gt; greatHouses = new ArrayList&lt;WesterosHouse&gt;();891 * greatHouses.add(new WesterosHouse(&quot;Stark&quot;, &quot;Winter is Coming&quot;));892 * greatHouses.add(new WesterosHouse(&quot;Lannister&quot;, &quot;Hear Me Roar!&quot;));893 * greatHouses.add(new WesterosHouse(&quot;Greyjoy&quot;, &quot;We Do Not Sow&quot;));894 * greatHouses.add(new WesterosHouse(&quot;Baratheon&quot;, &quot;Our is the Fury&quot;));895 * greatHouses.add(new WesterosHouse(&quot;Martell&quot;, &quot;Unbowed, Unbent, Unbroken&quot;));896 * greatHouses.add(new WesterosHouse(&quot;Tyrell&quot;, &quot;Growing Strong&quot;));897 *898 * // let's verify the words of the great houses of Westeros:899 * assertThat(greatHouses).extractingResultOf(&quot;sayTheWords&quot;)900 * .contains(&quot;Winter is Coming&quot;, &quot;We Do Not Sow&quot;, &quot;Hear Me Roar&quot;)901 * .doesNotContain(&quot;Lannisters always pay their debts&quot;);</code></pre>902 *903 * Following requirements have to be met to extract method results:904 * <ul>905 * <li>method has to be public,</li>906 * <li>method cannot accept any arguments,</li>907 * <li>method cannot return void.</li>908 * </ul>909 * <p>910 * Note that the order of extracted results is consistent with the iteration order of the Iterable under test, for911 * example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted results order.912 *913 * @param method the name of the method which result is to be extracted from the array under test914 * @return a new assertion object whose object under test is the Iterable of extracted values.915 * @throws IllegalArgumentException if no method exists with the given name, or method is not public, or method does916 * return void, or method accepts arguments.917 */918 @CheckReturnValue919 public AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> extractingResultOf(String method) {920 // can't refactor by calling extractingResultOf(method, Object.class) as SoftAssertion would fail921 List<Object> values = FieldsOrPropertiesExtractor.extract(actual, resultOf(method));922 String extractedDescription = extractedDescriptionOfMethod(method);923 String description = mostRelevantDescription(info.description(), extractedDescription);924 return newListAssertInstanceForMethodsChangingElementType(values).as(description);925 }926 /**927 * Extract the result of given method invocation on the Iterable's elements under test into a new list of the given928 * class, this new List becoming the object under test.929 * <p>930 * It allows you to test the method results of the Iterable's elements instead of testing the elements themselves, it931 * is especially useful for classes that do not conform to the Java Bean's getter specification (i.e. public String932 * toString() or public String status() instead of public String getStatus()).933 * <p>934 * Let's take an example to make things clearer :935 * <pre><code class='java'> // Build a array of WesterosHouse, a WesterosHouse has a method: public String sayTheWords()936 * List&lt;WesterosHouse&gt; greatHouses = new ArrayList&lt;WesterosHouse&gt;();937 * greatHouses.add(new WesterosHouse(&quot;Stark&quot;, &quot;Winter is Coming&quot;));938 * greatHouses.add(new WesterosHouse(&quot;Lannister&quot;, &quot;Hear Me Roar!&quot;));939 * greatHouses.add(new WesterosHouse(&quot;Greyjoy&quot;, &quot;We Do Not Sow&quot;));940 * greatHouses.add(new WesterosHouse(&quot;Baratheon&quot;, &quot;Our is the Fury&quot;));941 * greatHouses.add(new WesterosHouse(&quot;Martell&quot;, &quot;Unbowed, Unbent, Unbroken&quot;));942 * greatHouses.add(new WesterosHouse(&quot;Tyrell&quot;, &quot;Growing Strong&quot;));943 *944 * // let's verify the words of the great houses of Westeros:945 * assertThat(greatHouses).extractingResultOf(&quot;sayTheWords&quot;, String.class)946 * .contains(&quot;Winter is Coming&quot;, &quot;We Do Not Sow&quot;, &quot;Hear Me Roar&quot;)947 * .doesNotContain(&quot;Lannisters always pay their debts&quot;);</code></pre>948 *949 * Following requirements have to be met to extract method results:950 * <ul>951 * <li>method has to be public,</li>952 * <li>method cannot accept any arguments,</li>953 * <li>method cannot return void.</li>954 * </ul>955 * <p>956 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under957 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions of the extracted values958 * order.959 *960 * @param <P> the type of elements extracted.961 * @param method the name of the method which result is to be extracted from the array under test962 * @param extractedType type of element of the extracted List963 * @return a new assertion object whose object under test is the Iterable of extracted values.964 * @throws IllegalArgumentException if no method exists with the given name, or method is not public, or method does965 * return void or method accepts arguments.966 */967 @CheckReturnValue968 public <P> AbstractListAssert<?, List<? extends P>, P, ObjectAssert<P>> extractingResultOf(String method,969 Class<P> extractedType) {970 @SuppressWarnings("unchecked")971 List<P> values = (List<P>) FieldsOrPropertiesExtractor.extract(actual, resultOf(method));972 String extractedDescription = extractedDescriptionOfMethod(method);973 String description = mostRelevantDescription(info.description(), extractedDescription);974 return newListAssertInstanceForMethodsChangingElementType(values).as(description);975 }976 /**977 * Extract the values of given field or property from the Iterable's elements under test into a new Iterable, this new978 * Iterable becoming the Iterable under test.979 * <p>980 * It allows you to test a property/field of the Iterable's elements instead of testing the elements themselves,981 * which can be much less work !982 * <p>983 * Let's take an example to make things clearer :984 * <pre><code class='java'> // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)985 * // they can be public field or properties, both can be extracted.986 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();987 *988 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));989 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));990 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));991 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));992 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));993 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));994 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);995 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));996 *997 * // let's verify the names of TolkienCharacter in fellowshipOfTheRing :998 * assertThat(fellowshipOfTheRing).extracting(&quot;name&quot;, String.class)999 * .contains(&quot;Boromir&quot;, &quot;Gandalf&quot;, &quot;Frodo&quot;)1000 * .doesNotContain(&quot;Sauron&quot;, &quot;Elrond&quot;);1001 *1002 * // you can extract nested property/field like the name of Race :1003 * assertThat(fellowshipOfTheRing).extracting(&quot;race.name&quot;, String.class)1004 * .contains(&quot;Hobbit&quot;, &quot;Elf&quot;)1005 * .doesNotContain(&quot;Orc&quot;);</code></pre>1006 *1007 * A property with the given name is looked for first, if it doesn't exist then a field with the given name is looked1008 * for, if the field does not exist an {@link IntrospectionError} is thrown, by default private fields are read but1009 * you can change this with {@link Assertions#setAllowComparingPrivateFields(boolean)}, trying to read a private field1010 * when it's not allowed leads to an {@link IntrospectionError}.1011 * <p>1012 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under1013 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted values1014 * order.1015 * <hr>1016 * <p>1017 * Extracting also support maps, that is, instead of extracting values from an Object, it extract maps values1018 * corresponding to the given keys.1019 * <p>1020 * Example:1021 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);1022 * Employee luke = new Employee(2L, new Name("Luke"), 22);1023 * Employee han = new Employee(3L, new Name("Han"), 31);1024 *1025 * // build two maps1026 * Map&lt;String, Employee&gt; map1 = new HashMap&lt;&gt;();1027 * map1.put("key1", yoda);1028 * map1.put("key2", luke);1029 *1030 * Map&lt;String, Employee&gt; map2 = new HashMap&lt;&gt;();1031 * map2.put("key1", yoda);1032 * map2.put("key2", han);1033 *1034 * // instead of a list of objects, we have a list of maps1035 * List&lt;Map&lt;String, Employee&gt;&gt; maps = asList(map1, map2);1036 *1037 * // extracting a property in that case = get values from maps using property as a key1038 * assertThat(maps).extracting(key2, Employee.class).containsExactly(luke, han);1039 *1040 * // non type safe version1041 * assertThat(maps).extracting("key2").containsExactly(luke, han);1042 * assertThat(maps).extracting("key1").containsExactly(yoda, yoda);1043 *1044 * // it works with several keys, extracted values being wrapped in a Tuple1045 * assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));1046 *1047 * // unknown keys leads to null (map behavior)1048 * assertThat(maps).extracting("bad key").containsExactly(null, null);</code></pre>1049 *1050 * @param <P> the type of elements extracted.1051 * @param propertyOrField the property/field to extract from the Iterable under test1052 * @param extractingType type to return1053 * @return a new assertion object whose object under test is the list of extracted property/field values.1054 * @throws IntrospectionError if no field or property exists with the given name in one of the initial1055 * Iterable's element.1056 */1057 @CheckReturnValue1058 public <P> AbstractListAssert<?, List<? extends P>, P, ObjectAssert<P>> extracting(String propertyOrField,1059 Class<P> extractingType) {1060 @SuppressWarnings("unchecked")1061 List<P> values = (List<P>) FieldsOrPropertiesExtractor.extract(actual, byName(propertyOrField));1062 String extractedDescription = extractedDescriptionOf(propertyOrField);1063 String description = mostRelevantDescription(info.description(), extractedDescription);1064 return newListAssertInstanceForMethodsChangingElementType(values).as(description);1065 }1066 /**1067 * Extract the values of the given fields/properties from the Iterable's elements under test into a new Iterable composed1068 * of Tuples (a simple data structure), this new Iterable becoming the Iterable under test.1069 * <p>1070 * It allows you to test fields/properties of the Iterable's elements instead of testing the elements themselves,1071 * which can be much less work!1072 * <p>1073 * The Tuple data corresponds to the extracted values of the given fields/properties, for instance if you ask to1074 * extract "id", "name" and "email" then each Tuple data will be composed of id, name and email extracted from the1075 * element of the initial Iterable (the Tuple's data order is the same as the given fields/properties order).1076 * <p>1077 * Let's take an example to make things clearer :1078 * <pre><code class='java'> // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)1079 * // they can be public field or properties, both can be extracted.1080 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();1081 *1082 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));1083 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));1084 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));1085 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));1086 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));1087 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));1088 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);1089 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));1090 *1091 * // let's verify 'name' and 'age' of some TolkienCharacter in fellowshipOfTheRing :1092 * assertThat(fellowshipOfTheRing).extracting(&quot;name&quot;, &quot;age&quot;)1093 * .contains(tuple(&quot;Boromir&quot;, 37),1094 * tuple(&quot;Sam&quot;, 38),1095 * tuple(&quot;Legolas&quot;, 1000));1096 *1097 *1098 * // extract 'name', 'age' and Race name values :1099 * assertThat(fellowshipOfTheRing).extracting(&quot;name&quot;, &quot;age&quot;, &quot;race.name&quot;)1100 * .contains(tuple(&quot;Boromir&quot;, 37, &quot;Man&quot;),1101 * tuple(&quot;Sam&quot;, 38, &quot;Hobbit&quot;),1102 * tuple(&quot;Legolas&quot;, 1000, &quot;Elf&quot;));</code></pre>1103 *1104 * A property with the given name is looked for first, if it doesn't exist then a field with the given name is looked1105 * for, if the field does not exist an {@link IntrospectionError} is thrown, by default private fields are read but1106 * you can change this with {@link Assertions#setAllowComparingPrivateFields(boolean)}, trying to read a private field1107 * when it's not allowed leads to an {@link IntrospectionError}.1108 * <p>1109 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under1110 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted values1111 * order.1112 * <hr>1113 * <p>1114 * Extracting also support maps, that is, instead of extracting values from an Object, it extract maps values1115 * corresponding to the given keys.1116 * <p>1117 * Example:1118 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);1119 * Employee luke = new Employee(2L, new Name("Luke"), 22);1120 * Employee han = new Employee(3L, new Name("Han"), 31);1121 *1122 * // build two maps1123 * Map&lt;String, Employee&gt; map1 = new HashMap&lt;&gt;();1124 * map1.put("key1", yoda);1125 * map1.put("key2", luke);1126 *1127 * Map&lt;String, Employee&gt; map2 = new HashMap&lt;&gt;();1128 * map2.put("key1", yoda);1129 * map2.put("key2", han);1130 *1131 * // instead of a list of objects, we have a list of maps1132 * List&lt;Map&lt;String, Employee&gt;&gt; maps = asList(map1, map2);1133 *1134 * // extracting a property in that case = get values from maps using property as a key1135 * assertThat(maps).extracting("key2").containsExactly(luke, han);1136 * assertThat(maps).extracting("key1").containsExactly(yoda, yoda);1137 *1138 * // it works with several keys, extracted values being wrapped in a Tuple1139 * assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));1140 *1141 * // unknown keys leads to null (map behavior)1142 * assertThat(maps).extracting("bad key").containsExactly(null, null);</code></pre>1143 *1144 * @param propertiesOrFields the properties/fields to extract from the elements of the Iterable under test1145 * @return a new assertion object whose object under test is the list of Tuple with extracted properties/fields values1146 * as data.1147 * @throws IntrospectionError if one of the given name does not match a field or property in one of the initial1148 * Iterable's element.1149 */1150 @CheckReturnValue1151 public AbstractListAssert<?, List<? extends Tuple>, Tuple, ObjectAssert<Tuple>> extracting(String... propertiesOrFields) {1152 List<Tuple> values = FieldsOrPropertiesExtractor.extract(actual, byName(propertiesOrFields));1153 String extractedDescription = extractedDescriptionOf(propertiesOrFields);1154 String description = mostRelevantDescription(info.description(), extractedDescription);1155 return newListAssertInstanceForMethodsChangingElementType(values).as(description);1156 }1157 /**1158 * Extract the values from Iterable's elements under test by applying an extracting function on them. The returned1159 * iterable becomes a new object under test.1160 * <p>1161 * It allows to test values from the elements more safely than by using {@link #extracting(String)}, as it1162 * doesn't utilize introspection.1163 * <p>1164 * Let's have a look at an example :1165 * <pre><code class='java'> // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)1166 * // they can be public field or properties, both can be extracted.1167 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();1168 *1169 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));1170 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));1171 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));1172 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));1173 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));1174 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));1175 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);1176 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));1177 *1178 * // fellowship has hobbitses, right, my presioussss?1179 * assertThat(fellowshipOfTheRing).extracting(TolkienCharacter::getRace).contains(HOBBIT);</code></pre>1180 *1181 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under1182 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted values1183 * order.1184 *1185 * @param <V> the type of elements extracted.1186 * @param extractor the object transforming input object to desired one1187 * @return a new assertion object whose object under test is the list of values extracted1188 */1189 @CheckReturnValue1190 public <V> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> extracting(Function<? super ELEMENT, V> extractor) {1191 List<V> values = FieldsOrPropertiesExtractor.extract(actual, extractor);1192 return newListAssertInstanceForMethodsChangingElementType(values);1193 }1194 /**1195 * Extract the values from Iterable's elements under test by applying an extracting function (which might throw an1196 * exception) on them. The returned iterable becomes a new object under test.1197 * <p>1198 * Any checked exception raised in the extractor is rethrown wrapped in a {@link RuntimeException}.1199 * <p>1200 * It allows to test values from the elements more safely than by using {@link #extracting(String)}, as it1201 * doesn't utilize introspection.1202 * <p>1203 * Let's have a look at an example :1204 * <pre><code class='java'> // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)1205 * // they can be public field or properties, both can be extracted.1206 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();1207 *1208 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));1209 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));1210 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));1211 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));1212 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));1213 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));1214 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);1215 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));1216 *1217 * assertThat(fellowshipOfTheRing).extracting(input -&gt; {1218 * if (input.getAge() &lt; 20) {1219 * throw new Exception("age &lt; 20");1220 * }1221 * return input.getName();1222 * }).contains("Frodo");</code></pre>1223 *1224 * Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under1225 * test, for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted values1226 * order.1227 *1228 * @param <EXCEPTION> the exception type of {@link ThrowingExtractor}1229 * @param <V> the type of elements extracted.1230 * @param extractor the object transforming input object to desired one1231 * @return a new assertion object whose object under test is the list of values extracted1232 * @since 3.7.01233 */1234 @CheckReturnValue1235 public <V, EXCEPTION extends Exception> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> extracting(ThrowingExtractor<? super ELEMENT, V, EXCEPTION> extractor) {1236 List<V> values = FieldsOrPropertiesExtractor.extract(actual, extractor);1237 return newListAssertInstanceForMethodsChangingElementType(values);1238 }1239 /*1240 * Should be used after any methods changing the elements type like {@link #extracting(Function)} as it will propagate the1241 * correct1242 * assertions state, that is everything but the element comparator (since the element type has changed).1243 */1244 private <V> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> newListAssertInstanceForMethodsChangingElementType(List<V> values) {1245 if (actual instanceof SortedSet) {1246 // Reset the natural element comparator set when building an iterable assert instance for a SortedSet as it is likely not1247 // compatible with extracted values type, example with a SortedSet<Person> using a comparator on the Person's age, after1248 // extracting names we get a a List<String> which is mot suitable for the age comparator1249 usingDefaultElementComparator();1250 }1251 return newListAssertInstance(values).withAssertionState(myself);1252 }1253 /**1254 * Extract the Iterable values from Iterable's elements under test by applying an Iterable extracting function on them1255 * and concatenating the result lists. The returned iterable becomes a new object under test.1256 * <p>1257 * It allows testing the results of extracting values that are represented by Iterables.1258 * <p>1259 * For example:1260 * <pre><code class='java'> CartoonCharacter bart = new CartoonCharacter("Bart Simpson");1261 * CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");1262 * CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");1263 * CartoonCharacter homer = new CartoonCharacter("Homer Simpson");1264 * homer.getChildren().add(bart);1265 * homer.getChildren().add(lisa);1266 * homer.getChildren().add(maggie);1267 *1268 * CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");1269 * CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");1270 * fred.getChildren().add(pebbles);1271 *1272 * List&lt;CartoonCharacter&gt; parents = list(homer, fred);1273 *1274 * // check children property which is a List&lt;CartoonCharacter&gt;1275 * assertThat(parents).flatExtracting(CartoonCharacter::getChildren)1276 * .containsOnly(bart, lisa, maggie, pebbles);</code></pre>1277 *1278 * The order of extracted values is consistent with both the order of the collection itself, as well as the extracted1279 * collections.1280 *1281 * @param <V> the type of elements extracted.1282 * @param extractor the object transforming input object to an {@code Iterable} of desired ones1283 * @return a new assertion object whose object under test is the list of values extracted1284 * @throws NullPointerException if one of the {@code Iterable}'s element is null.1285 */1286 @CheckReturnValue1287 public <V> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> flatExtracting(Function<? super ELEMENT, ? extends Collection<V>> extractor) {1288 return doFlatExtracting(extractor);1289 }1290 /**1291 * Extract the Iterable values from Iterable's elements under test by applying an Iterable extracting function (which1292 * might throw a checked exception) on them and concatenating the result lists. The returned iterable becomes a new object1293 * under test.1294 * <p>1295 * It allows testing the results of extracting values that are represented by Iterables.1296 * <p>1297 * For example:1298 * <pre><code class='java'> CartoonCharacter bart = new CartoonCharacter("Bart Simpson");1299 * CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");1300 * CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");1301 * CartoonCharacter homer = new CartoonCharacter("Homer Simpson");1302 * homer.getChildren().add(bart);1303 * homer.getChildren().add(lisa);1304 * homer.getChildren().add(maggie);1305 *1306 * CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");1307 * CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");1308 * fred.getChildren().add(pebbles);1309 *1310 * List&lt;CartoonCharacter&gt; parents = list(homer, fred);1311 *1312 * // check children property where getChildren() can throw an Exception!1313 * assertThat(parents).flatExtracting(CartoonCharacter::getChildren)1314 * .containsOnly(bart, lisa, maggie, pebbles);</code></pre>1315 *1316 * The order of extracted values is consistent with both the order of the collection itself, as well as the extracted1317 * collections.1318 *1319 * @param <V> the type of elements extracted.1320 * @param <EXCEPTION> the exception type of {@link ThrowingExtractor}1321 * @param extractor the object transforming input object to an {@code Iterable} of desired ones1322 * @return a new assertion object whose object under test is the list of values extracted1323 * @throws NullPointerException if one of the {@code Iterable}'s element is null.1324 * @since 3.7.01325 */1326 @CheckReturnValue1327 public <V, EXCEPTION extends Exception> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> flatExtracting(ThrowingExtractor<? super ELEMENT, ? extends Collection<V>, EXCEPTION> extractor) {1328 return doFlatExtracting(extractor);1329 }1330 private <V> AbstractListAssert<?, List<? extends V>, V, ObjectAssert<V>> doFlatExtracting(Function<? super ELEMENT, ? extends Collection<V>> extractor) {1331 List<V> result = FieldsOrPropertiesExtractor.extract(actual, extractor).stream()1332 .flatMap(Collection::stream)1333 .collect(toList());1334 return newListAssertInstanceForMethodsChangingElementType(result);1335 }1336 /**1337 * Extract multiple values from each {@code Iterable}'s element according to the given {@code Function}s1338 * and concatenate/flatten the extracted values in a list that is used as the new object under test.1339 * <p>1340 * If extracted values were not flattened, instead of a simple list like (given 2 extractors) :1341 * <pre>element1.value1, element1.value2, element2.value1, element2.value2, ... </pre>1342 * we would get a list of list like :1343 * <pre>list(element1.value1, element1.value2), list(element2.value1, element2.value2), ... </pre>1344 * <p>1345 * Code example:1346 * <pre><code class='java'> // fellowshipOfTheRing is a List&lt;TolkienCharacter&gt;1347 *1348 * // values are extracted in order and flattened : age1, name1, age2, name2, age3 ...1349 * assertThat(fellowshipOfTheRing).flatExtracting(TolkienCharacter::getAge,1350 * TolkienCharacter::getName)1351 * .contains(33 ,"Frodo",1352 * 1000, "Legolas",1353 * 87, "Aragorn");</code></pre>1354 *1355 * The resulting extracted values list is ordered by {@code Iterable}'s element first and then extracted values,1356 * this is why is in the example that age values come before names.1357 *1358 * @param extractors all the extractors to apply on each actual {@code Iterable}'s elements1359 * @return a new assertion object whose object under test is a flattened list of all extracted values.1360 */1361 @CheckReturnValue1362 public AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> flatExtracting(@SuppressWarnings("unchecked") Function<? super ELEMENT, ?>... extractors) {1363 Stream<? extends ELEMENT> actualStream = stream(actual.spliterator(), false);1364 List<Object> result = actualStream.flatMap(element -> Stream.of(extractors)1365 .map(extractor -> extractor.apply(element)))1366 .collect(toList());1367 return newListAssertInstanceForMethodsChangingElementType(result);1368 }1369 /**1370 * Extract multiple values from each {@code Iterable}'s element according to the given {@link ThrowingExtractor}s1371 * and concatenate/flatten the extracted values in a list that is used as the new object under test.1372 * <p>1373 * If extracted values were not flattened, instead of a simple list like (given 2 extractors) :1374 * <pre>element1.value1, element1.value2, element2.value1, element2.value2, ... </pre>1375 * we would get a list of list like :1376 * <pre>list(element1.value1, element1.value2), list(element2.value1, element2.value2), ... </pre>1377 * <p>1378 * Code example:1379 * <pre><code class='java'> // fellowshipOfTheRing is a List&lt;TolkienCharacter&gt;1380 *1381 * // values are extracted in order and flattened : age1, name1, age2, name2, age3 ...1382 * assertThat(fellowshipOfTheRing).flatExtracting(input -&gt; {1383 * if (input.getAge() &lt; 20) {1384 * throw new Exception("age &lt; 20");1385 * }1386 * return input.getName();1387 * }, input2 -&gt; {1388 * if (input2.getAge() &lt; 20) {1389 * throw new Exception("age &lt; 20");1390 * }1391 * return input2.getAge();1392 * }).contains(33 ,"Frodo",1393 * 1000, "Legolas",1394 * 87, "Aragorn");</code></pre>1395 *1396 * The resulting extracted values list is ordered by {@code Iterable}'s element first and then extracted values,1397 * this is why is in the example that age values come before names.1398 *1399 * @param <EXCEPTION> the exception type of {@link ThrowingExtractor}1400 * @param extractors all the extractors to apply on each actual {@code Iterable}'s elements1401 * @return a new assertion object whose object under test is a flattened list of all extracted values.1402 * @since 3.7.01403 */1404 @CheckReturnValue1405 public <EXCEPTION extends Exception> AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> flatExtracting(@SuppressWarnings("unchecked") ThrowingExtractor<? super ELEMENT, ?, EXCEPTION>... extractors) {1406 Stream<? extends ELEMENT> actualStream = stream(actual.spliterator(), false);1407 List<Object> result = actualStream.flatMap(element -> Stream.of(extractors)1408 .map(extractor -> extractor.apply(element)))1409 .collect(toList());1410 return newListAssertInstanceForMethodsChangingElementType(result);1411 }1412 /**1413 * Extract from Iterable's elements the Iterable/Array values corresponding to the given property/field name and1414 * concatenate them into a single list becoming the new object under test.1415 * <p>1416 * It allows testing the elements of extracting values that are represented by iterables or arrays.1417 * <p>1418 * For example:1419 * <pre><code class='java'> CartoonCharacter bart = new CartoonCharacter("Bart Simpson");1420 * CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");1421 * CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");1422 * CartoonCharacter homer = new CartoonCharacter("Homer Simpson");1423 * homer.getChildren().add(bart);1424 * homer.getChildren().add(lisa);1425 * homer.getChildren().add(maggie);1426 *1427 * CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");1428 * CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");1429 * fred.getChildren().add(pebbles);1430 *1431 * List&lt;CartoonCharacter&gt; parents = list(homer, fred);1432 *1433 * // check children which is a List&lt;CartoonCharacter&gt;1434 * assertThat(parents).flatExtracting("children")1435 * .containsOnly(bart, lisa, maggie, pebbles);</code></pre>1436 *1437 * The order of extracted values is consisted with both the order of the collection itself, as well as the extracted1438 * collections.1439 *1440 * @param fieldOrPropertyName the object transforming input object to an Iterable of desired ones1441 * @return a new assertion object whose object under test is the list of values extracted1442 * @throws IllegalArgumentException if one of the extracted property value was not an array or an iterable.1443 */1444 @CheckReturnValue1445 public AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> flatExtracting(String fieldOrPropertyName) {1446 List<Object> extractedValues = newArrayList();1447 List<?> extractedGroups = FieldsOrPropertiesExtractor.extract(actual, byName(fieldOrPropertyName));1448 for (Object group : extractedGroups) {1449 // expecting group to be an iterable or an array1450 if (isArray(group)) {1451 int size = Array.getLength(group);1452 for (int i = 0; i < size; i++) {1453 extractedValues.add(Array.get(group, i));1454 }1455 } else if (group instanceof Iterable) {1456 Iterable<?> iterable = (Iterable<?>) group;1457 for (Object value : iterable) {1458 extractedValues.add(value);1459 }1460 } else {1461 CommonErrors.wrongElementTypeForFlatExtracting(group);1462 }1463 }1464 return newListAssertInstanceForMethodsChangingElementType(extractedValues);1465 }1466 /**1467 * Use the given {@link Function}s to extract the values from the {@link Iterable}'s elements into a new {@link Iterable}1468 * composed of {@link Tuple}s (a simple data structure containing the extracted values), this new {@link Iterable} becoming the1469 * object under test.1470 * <p>1471 * It allows you to test values from the {@link Iterable}'s elements instead of testing the elements themselves, which sometimes can be1472 * much less work!1473 * <p>1474 * The Tuple data corresponds to the extracted values from the Iterable's elements, for instance if you pass functions1475 * extracting "id", "name" and "email" values then each Tuple data will be composed of an id, a name and an email1476 * extracted from the element of the initial Iterable (the Tuple's data order is the same as the given functions1477 * order).1478 * <p>1479 * Let's take a look at an example to make things clearer :1480 * <pre><code class='java'> // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)1481 * // they can be public field or properties, both can be extracted.1482 * List&lt;TolkienCharacter&gt; fellowshipOfTheRing = new ArrayList&lt;TolkienCharacter&gt;();1483 *1484 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Frodo&quot;, 33, HOBBIT));1485 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Sam&quot;, 38, HOBBIT));1486 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gandalf&quot;, 2020, MAIA));1487 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Legolas&quot;, 1000, ELF));1488 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Pippin&quot;, 28, HOBBIT));1489 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Gimli&quot;, 139, DWARF));1490 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Aragorn&quot;, 87, MAN);1491 * fellowshipOfTheRing.add(new TolkienCharacter(&quot;Boromir&quot;, 37, MAN));1492 *1493 * // let's verify 'name', 'age' and Race of some TolkienCharacter in fellowshipOfTheRing :1494 * assertThat(fellowshipOfTheRing).extracting(TolkienCharacter::getName,1495 * character -&gt; character.getAge(),1496 * TolkienCharacter::getRace)1497 * .containsOnly(tuple(&quot;Frodo&quot;, 33, HOBBIT),1498 * tuple(&quot;Sam&quot;, 38, HOBBIT),1499 * tuple(&quot;Gandalf&quot;, 2020, MAIA),1500 * tuple(&quot;Legolas&quot;, 1000, ELF),1501 * tuple(&quot;Pippin&quot;, 28, HOBBIT),1502 * tuple(&quot;Gimli&quot;, 139, DWARF),1503 * tuple(&quot;Aragorn&quot;, 87, MAN),1504 * tuple(&quot;Boromir&quot;, 37, MAN));</code></pre>1505 * You can use lambda expression or a method reference to extract the expected values.1506 * <p>1507 * Use {@link Tuple#tuple(Object...)} to initialize the expected values.1508 * <p>1509 * Note that the order of the extracted tuples list is consistent with the iteration order of the Iterable under test,1510 * for example if it's a {@link HashSet}, you won't be able to make any assumptions on the extracted tuples order.1511 *1512 * @param extractors the extractor functions to extract a value from an element of the Iterable under test.1513 * @return a new assertion object whose object under test is the list of Tuples containing the extracted values.1514 */1515 @CheckReturnValue1516 public AbstractListAssert<?, List<? extends Tuple>, Tuple, ObjectAssert<Tuple>> extracting(@SuppressWarnings("unchecked") Function<? super ELEMENT, ?>... extractors) {1517 // combine all extractors into one function1518 Function<ELEMENT, Tuple> tupleExtractor = objectToExtractValueFrom -> new Tuple(Stream.of(extractors)1519 .map(extractor -> extractor.apply(objectToExtractValueFrom))1520 .toArray());1521 List<Tuple> tuples = stream(actual.spliterator(), false).map(tupleExtractor)1522 .collect(toList());1523 return newListAssertInstanceForMethodsChangingElementType(tuples);1524 }1525 /**1526 * Extract the given property/field values from each {@code Iterable}'s element and1527 * flatten the extracted values in a list that is used as the new object under test.1528 * <p>1529 * Given 2 properties, if the extracted values were not flattened, instead having a simple list like :1530 * <pre>element1.value1, element1.value2, element2.value1, element2.value2, ... </pre>1531 * ... we would get a list of list :1532 * <pre>list(element1.value1, element1.value2), list(element2.value1, element2.value2), ... </pre>1533 * <p>1534 * Code example:1535 * <pre><code class='java'> // fellowshipOfTheRing is a List&lt;TolkienCharacter&gt;1536 *1537 * // values are extracted in order and flattened : age1, name1, age2, name2, age3 ...1538 * assertThat(fellowshipOfTheRing).flatExtracting("age", "name")1539 * .contains(33 ,"Frodo",1540 * 1000, "Legolas",1541 * 87, "Aragorn");</code></pre>1542 *1543 * @param fieldOrPropertyNames the field and/or property names to extract from each actual {@code Iterable}'s element1544 * @return a new assertion object whose object under test is a flattened list of all extracted values.1545 * @throws IllegalArgumentException if fieldOrPropertyNames vararg is null or empty1546 * @since 2.5.0 / 3.5.01547 */1548 @CheckReturnValue1549 public AbstractListAssert<?, List<? extends Object>, Object, ObjectAssert<Object>> flatExtracting(String... fieldOrPropertyNames) {1550 List<Object> extractedValues = FieldsOrPropertiesExtractor.extract(actual, byName(fieldOrPropertyNames)).stream()1551 .flatMap(tuple -> tuple.toList().stream())1552 .collect(toList());1553 return newListAssertInstanceForMethodsChangingElementType(extractedValues);1554 }1555 /**1556 * {@inheritDoc}1557 */1558 @Override1559 public SELF containsExactlyElementsOf(Iterable<? extends ELEMENT> iterable) {1560 return containsExactly(toArray(iterable));1561 }1562 /**1563 * {@inheritDoc}1564 */1565 @Deprecated1566 @Override1567 public SELF containsOnlyElementsOf(Iterable<? extends ELEMENT> iterable) {1568 return containsOnly(toArray(iterable));1569 }1570 /**1571 * {@inheritDoc}1572 */1573 @Override1574 public SELF containsOnlyOnceElementsOf(Iterable<? extends ELEMENT> iterable) {1575 return containsOnlyOnce(toArray(iterable));1576 }1577 /**1578 * {@inheritDoc}1579 */1580 @Override1581 public SELF hasSameElementsAs(Iterable<? extends ELEMENT> iterable) {1582 // containsOnlyElementsOf is deprecated so we use its implementation1583 return containsOnly(toArray(iterable));1584 }1585 /**1586 * Allows to set a comparator to compare properties or fields of elements with the given names.1587 * A typical usage is for comparing fields of numeric type at a given precision.1588 * <p>1589 * To be used, comparators need to be specified by this method <b>before</b> calling any of:1590 * <ul>1591 * <li>{@link #usingFieldByFieldElementComparator}</li>1592 * <li>{@link #usingElementComparatorOnFields}</li>1593 * <li>{@link #usingElementComparatorIgnoringFields}</li>1594 * <li>{@link #usingRecursiveFieldByFieldElementComparator}</li>1595 * </ul>1596 * <p>1597 * Comparators specified by this method have precedence over comparators specified by1598 * {@link #usingComparatorForElementFieldsWithType(Comparator, Class) usingComparatorForElementFieldsWithType}.1599 * <p>1600 * Example:1601 *1602 * <pre><code class='java'> public class TolkienCharacter {1603 * private String name;1604 * private double height;1605 * // constructor omitted1606 * }1607 *1608 * TolkienCharacter frodo = new TolkienCharacter(&quot;Frodo&quot;, 1.2);1609 * TolkienCharacter tallerFrodo = new TolkienCharacter(&quot;Frodo&quot;, 1.3);1610 * TolkienCharacter reallyTallFrodo = new TolkienCharacter(&quot;Frodo&quot;, 1.9);1611 *1612 * Comparator&lt;Double&gt; closeEnough = new Comparator&lt;Double&gt;() {1613 * double precision = 0.5;1614 * public int compare(Double d1, Double d2) {1615 * return Math.abs(d1 - d2) &lt;= precision ? 0 : 1;1616 * }1617 * };1618 *1619 * // assertions will pass1620 * assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, &quot;height&quot;)1621 * .usingFieldByFieldElementComparator()1622 * .contains(tallerFrodo);1623 *1624 * assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, &quot;height&quot;)1625 * .usingElementComparatorOnFields(&quot;height&quot;)1626 * .contains(tallerFrodo);1627 *1628 * assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, &quot;height&quot;)1629 * .usingElementComparatorIgnoringFields(&quot;name&quot;)1630 * .contains(tallerFrodo);1631 *1632 * assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, &quot;height&quot;)1633 * .usingRecursiveFieldByFieldElementComparator()1634 * .contains(tallerFrodo);1635 *1636 * // assertion will fail1637 * assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, &quot;height&quot;)1638 * .usingFieldByFieldElementComparator()1639 * .containsExactly(reallyTallFrodo);</code></pre>1640 *1641 * @param <T> the type of elements to compare.1642 * @param comparator the {@link java.util.Comparator} to use1643 * @param elementPropertyOrFieldNames the names of the properties and/or fields of the elements the comparator should be used for1644 * @return {@code this} assertions object1645 * @since 2.5.0 / 3.5.01646 */1647 @CheckReturnValue1648 public <T> SELF usingComparatorForElementFieldsWithNames(Comparator<T> comparator,1649 String... elementPropertyOrFieldNames) {1650 for (String elementPropertyOrField : elementPropertyOrFieldNames) {1651 comparatorsForElementPropertyOrFieldNames.put(elementPropertyOrField, comparator);1652 }1653 return myself;1654 }1655 /**1656 * Allows to set a specific comparator to compare properties or fields of elements with the given type.1657 * A typical usage is for comparing fields of numeric type at a given precision.1658 * <p>1659 * To be used, comparators need to be specified by this method <b>before</b> calling any of:1660 * <ul>1661 * <li>{@link #usingFieldByFieldElementComparator}</li>1662 * <li>{@link #usingElementComparatorOnFields}</li>1663 * <li>{@link #usingElementComparatorIgnoringFields}</li>1664 * <li>{@link #usingRecursiveFieldByFieldElementComparator}</li>1665 * </ul>1666 * <p>1667 * Comparators specified by {@link #usingComparatorForElementFieldsWithNames(Comparator, String...) usingComparatorForElementFieldsWithNames}1668 * have precedence over comparators specified by this method.1669 * <p>1670 * Example:1671 * <pre><code class='java'> public class TolkienCharacter {1672 * private String name;1673 * private double height;1674 * // constructor omitted1675 * }1676 * TolkienCharacter frodo = new TolkienCharacter(&quot;Frodo&quot;, 1.2);1677 * TolkienCharacter tallerFrodo = new TolkienCharacter(&quot;Frodo&quot;, 1.3);1678 * TolkienCharacter reallyTallFrodo = new TolkienCharacter(&quot;Frodo&quot;, 1.9);1679 *1680 * Comparator&lt;Double&gt; closeEnough = new Comparator&lt;Double&gt;() {1681 * double precision = 0.5;1682 * public int compare(Double d1, Double d2) {1683 * return Math.abs(d1 - d2) &lt;= precision ? 0 : 1;1684 * }1685 * };1686 *1687 * // assertions will pass1688 * assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)1689 * .usingFieldByFieldElementComparator()1690 * .contains(tallerFrodo);1691 *1692 * assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)1693 * .usingElementComparatorOnFields(&quot;height&quot;)1694 * .contains(tallerFrodo);1695 *1696 * assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)1697 * .usingElementComparatorIgnoringFields(&quot;name&quot;)1698 * .contains(tallerFrodo);1699 *1700 * assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)1701 * .usingRecursiveFieldByFieldElementComparator()1702 * .contains(tallerFrodo);1703 *1704 * // assertion will fail1705 * assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)1706 * .usingFieldByFieldElementComparator()1707 * .contains(reallyTallFrodo);</code></pre>1708 *1709 * @param <T> the type of elements to compare.1710 * @param comparator the {@link java.util.Comparator} to use1711 * @param type the {@link java.lang.Class} of the type of the element fields the comparator should be used for1712 * @return {@code this} assertions object1713 * @since 2.5.0 / 3.5.01714 */1715 @CheckReturnValue1716 public <T> SELF usingComparatorForElementFieldsWithType(Comparator<T> comparator, Class<T> type) {1717 getComparatorsForElementPropertyOrFieldTypes().put(type, comparator);1718 return myself;1719 }1720 /**1721 * Allows to set a specific comparator for the given type of elements or their fields.1722 * Extends {@link #usingComparatorForElementFieldsWithType} by applying comparator specified for given type1723 * to elements themselves, not only to their fields.1724 * <p>1725 * Usage of this method affects comparators set by next methods:1726 * <ul>1727 * <li>{@link #usingFieldByFieldElementComparator}</li>1728 * <li>{@link #usingElementComparatorOnFields}</li>1729 * <li>{@link #usingElementComparatorIgnoringFields}</li>1730 * <li>{@link #usingRecursiveFieldByFieldElementComparator}</li>1731 * </ul>1732 * <p>1733 * Example:1734 * <pre><code class='java'>1735 * // assertion will pass1736 * assertThat(asList("some", new BigDecimal("4.2")))1737 * .usingComparatorForType(BIG_DECIMAL_COMPARATOR, BigDecimal.class)1738 * .contains(new BigDecimal("4.20"));1739 * </code></pre>1740 *1741 * @param <T> the type of elements to compare.1742 * @param comparator the {@link java.util.Comparator} to use1743 * @param type the {@link java.lang.Class} of the type of the element or element fields the comparator should be used for1744 * @return {@code this} assertions object1745 * @since 2.9.0 / 3.9.01746 */1747 @CheckReturnValue1748 public <T> SELF usingComparatorForType(Comparator<T> comparator, Class<T> type) {1749 if (iterables.getComparator() == null) {1750 usingElementComparator(new ExtendedByTypesComparator(getComparatorsByType()));1751 }1752 getComparatorsForElementPropertyOrFieldTypes().put(type, comparator);1753 getComparatorsByType().put(type, comparator);1754 return myself;1755 }1756 /**1757 * Use field/property by field/property comparison (including inherited fields/properties) instead of relying on1758 * actual type A <code>equals</code> method to compare group elements for incoming assertion checks. Private fields1759 * are included but this can be disabled using {@link Assertions#setAllowExtractingPrivateFields(boolean)}.1760 * <p>1761 * This can be handy if <code>equals</code> method of the objects to compare does not suit you.1762 * <p>1763 * Note that the comparison is <b>not</b> recursive, if one of the fields/properties is an Object, it will be compared1764 * to the other field/property using its <code>equals</code> method.1765 * <p>1766 * You can specify a custom comparator per name or type of element field with1767 * {@link #usingComparatorForElementFieldsWithNames(Comparator, String...)}1768 * and {@link #usingComparatorForElementFieldsWithType(Comparator, Class)}.1769 * <p>1770 * Example:1771 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);1772 * TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);1773 *1774 * // Fail if equals has not been overridden in TolkienCharacter as equals default implementation only compares references1775 * assertThat(newArrayList(frodo)).contains(frodoClone);1776 *1777 * // frodo and frodoClone are equals when doing a field by field comparison.1778 * assertThat(newArrayList(frodo)).usingFieldByFieldElementComparator().contains(frodoClone);</code></pre>1779 *1780 * @return {@code this} assertion object.1781 */1782 @CheckReturnValue1783 public SELF usingFieldByFieldElementComparator() {1784 return usingExtendedByTypesElementComparator(new FieldByFieldComparator(comparatorsForElementPropertyOrFieldNames,1785 getComparatorsForElementPropertyOrFieldTypes()));1786 }1787 /**1788 * Use a recursive field/property by field/property comparison (including inherited fields/properties)1789 * instead of relying on actual type <code>equals</code> method to compare group elements for incoming1790 * assertion checks. This can be useful if actual's {@code equals} implementation does not suit you.1791 * <p>1792 * The recursive property/field comparison is <b>not</b> applied on fields having a custom {@code equals}1793 * implementation, i.e. the overridden {@code equals} method will be used instead of a field/property by field/property1794 * comparison.1795 * <p>1796 * The recursive comparison handles cycles.1797 * <p>1798 * You can specify a custom comparator per (nested) name or type of element field with1799 * {@link #usingComparatorForElementFieldsWithNames(Comparator, String...) usingComparatorForElementFieldsWithNames}1800 * and {@link #usingComparatorForElementFieldsWithType(Comparator, Class) usingComparatorForElementFieldsWithType}.1801 * <p>1802 * The objects to compare can be of different types but must have the same properties/fields. For example if actual1803 * object has a {@code name} String field, the other object must also have one.1804 * <p>1805 * If an object has a field and a property with the same name, the property value will be used over the field.1806 * <p>1807 * Example:1808 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);1809 * TolkienCharacter pippin = new TolkienCharacter("Pippin", 28, HOBBIT);1810 * frodo.setFriend(pippin);1811 * pippin.setFriend(frodo);1812 *1813 * TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);1814 * TolkienCharacter pippinClone = new TolkienCharacter("Pippin", 28, HOBBIT);1815 * frodoClone.setFriend(pippinClone);1816 * pippinClone.setFriend(frodoClone);1817 *1818 * List&lt;TolkienCharacter&gt; hobbits = Arrays.asList(frodo, pippin);1819 *1820 * // fails if equals has not been overridden in TolkienCharacter as it would compares object references1821 * assertThat(hobbits).contains(frodoClone, pippinClone);1822 *1823 * // frodo/frodoClone and pippin/pippinClone are equals when doing a recursive property/field by property/field comparison1824 * assertThat(hobbits).usingRecursiveFieldByFieldElementComparator()1825 * .contains(frodoClone, pippinClone);</code>1826 * </pre>1827 *1828 * @return {@code this} assertion object.1829 * @since 2.5.0 / 3.5.01830 */1831 @CheckReturnValue1832 public SELF usingRecursiveFieldByFieldElementComparator() {1833 return usingExtendedByTypesElementComparator(new RecursiveFieldByFieldComparator(comparatorsForElementPropertyOrFieldNames,1834 getComparatorsForElementPropertyOrFieldTypes()));1835 }1836 /**1837 * Enable using a recursive field by field comparison strategy similar to {@link #usingRecursiveComparison()} but contrary to the latter <b>you can chain any iterable assertions after this method</b> (this is why this method exists).1838 * <p>1839 * The given {@link RecursiveComparisonConfiguration} is used to tweak the comparison behavior, for example by {@link RecursiveComparisonConfiguration#ignoreCollectionOrder(boolean) ignoring collection order}.1840 * <p>1841 * <b>Warning:</b> the comparison won't use any comparators set with:1842 * <ul>1843 * <li>{@link #usingComparatorForType(Comparator, Class)}</li>1844 * <li>{@link #withTypeComparators(TypeComparators)}</li>1845 * <li>{@link #usingComparatorForElementFieldsWithType(Comparator, Class)}</li>1846 * <li>{@link #withComparatorsForElementPropertyOrFieldTypes(TypeComparators)}</li>1847 * <li>{@link #usingComparatorForElementFieldsWithNames(Comparator, String...)}</li>1848 * <li>{@link #withComparatorsForElementPropertyOrFieldNames(Map)}</li>1849 * </ul>1850 * <p>1851 * These features (and many more) are provided through {@link RecursiveComparisonConfiguration} with:1852 * <ul>1853 * <li>{@link RecursiveComparisonConfiguration#registerComparatorForType(Comparator, Class) registerComparatorForType(Comparator, Class)} / {@link RecursiveComparisonConfiguration.Builder#withComparatorForType(Comparator, Class) withComparatorForType(Comparator, Class)} (using {@link RecursiveComparisonConfiguration.Builder})</li>1854 * <li>{@link RecursiveComparisonConfiguration#registerEqualsForType(java.util.function.BiPredicate, Class) registerEqualsForType(BiPredicate, Class)} / {@link RecursiveComparisonConfiguration.Builder#withComparatorForType(Comparator, Class) withComparatorForType(Comparator, Class)} (using {@link RecursiveComparisonConfiguration.Builder})</li>1855 * <li>{@link RecursiveComparisonConfiguration#registerComparatorForFields(Comparator, String...) registerComparatorForFields(Comparator comparator, String... fields)} / {@link RecursiveComparisonConfiguration.Builder#withComparatorForFields(Comparator, String...) withComparatorForField(Comparator comparator, String... fields)} (using {@link RecursiveComparisonConfiguration.Builder})</li>1856 * </ul>1857 * <p>1858 * RecursiveComparisonConfiguration exposes a {@link RecursiveComparisonConfiguration.Builder builder} to ease setting the comparison behaviour,1859 * call {@link RecursiveComparisonConfiguration#builder() RecursiveComparisonConfiguration.builder()} to start building your configuration.1860 * <p>1861 * There are differences between this approach and {@link #usingRecursiveComparison()}:1862 * <ul>1863 * <li>contrary to {@link RecursiveComparisonAssert}, you can chain any iterable assertions after this method.</li>1864 * <li>no comparators registered with {@link AbstractIterableAssert#usingComparatorForType(Comparator, Class)} will be used, you need to register them in the configuration object.</li>1865 * <li>the assertion errors won't be as detailed as {@link RecursiveComparisonAssert#isEqualTo(Object)} which shows the field differences.</li>1866 * </ul>1867 * <p>1868 * This last point makes sense, take the {@link #contains(Object...)} assertion, it would not be relevant to report the differences of all the iterable's elements differing from the values to look for.1869 * <p>1870 * Example:1871 * <pre><code class='java'> public class Person {1872 * String name;1873 * boolean hasPhd;1874 * }1875 *1876 * public class Doctor {1877 * String name;1878 * boolean hasPhd;1879 * }1880 *1881 * Doctor drSheldon = new Doctor("Sheldon Cooper", true);1882 * Doctor drLeonard = new Doctor("Leonard Hofstadter", true);1883 * Doctor drRaj = new Doctor("Raj Koothrappali", true);1884 *1885 * Person sheldon = new Person("Sheldon Cooper", false);1886 * Person leonard = new Person("Leonard Hofstadter", false);1887 * Person raj = new Person("Raj Koothrappali", false);1888 * Person howard = new Person("Howard Wolowitz", false);1889 *1890 * List&lt;Doctor&gt; doctors = list(drSheldon, drLeonard, drRaj);1891 * List&lt;Person&gt; people = list(sheldon, leonard, raj);1892 *1893 * RecursiveComparisonConfiguration configuration = RecursiveComparisonConfiguration.builder()1894 * .withIgnoredFields​("hasPhd");1895 *1896 * // assertion succeeds as both lists contains equivalent items in order.1897 * assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)1898 * .contains(sheldon);1899 *1900 * // assertion fails because leonard names are different.1901 * leonard.setName("Leonard Ofstater");1902 * assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)1903 * .contains(leonard);1904 *1905 * // assertion fails because howard is missing and leonard is not expected.1906 * people = list(howard, sheldon, raj)1907 * assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)1908 * .contains(howard);</code></pre>1909 *1910 * A detailed documentation for the recursive comparison is available here: <a href="https://assertj.github.io/doc/#assertj-core-recursive-comparison">https://assertj.github.io/doc/#assertj-core-recursive-comparison</a>.1911 * <p>1912 * The default recursive comparison behavior is {@link RecursiveComparisonConfiguration configured} as follows:1913 * <ul>1914 * <li> different types of iterable can be compared by default, this allows to compare for example an {@code List<Person>} and a {@code LinkedHashSet<PersonDto>}.<br>1915 * This behavior can be turned off by calling {@link RecursiveComparisonAssert#withStrictTypeChecking() withStrictTypeChecking}.</li>1916 * <li>overridden equals methods are used in the comparison (unless stated otherwise - see <a href="https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals">https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals</a>)</li>1917 * <li>the following types are compared with these comparators:1918 * <ul>1919 * <li>{@code java.lang.Double}: {@code DoubleComparator} with precision of 1.0E-15</li>1920 * <li>{@code java.lang.Float}: {@code FloatComparator }with precision of 1.0E-6</li>1921 * </ul>1922 * </li>1923 * </ul>1924 * <p>1925 * Another point worth mentioning: <b>elements order does matter if the expected iterable is ordered</b>, for example comparing a {@code Set<Person>} to a {@code List<Person>} fails as {@code List} is ordered and {@code Set} is not.<br>1926 * The ordering can be ignored by calling {@link RecursiveComparisonAssert#ignoringCollectionOrder ignoringCollectionOrder} allowing ordered/unordered iterable comparison, note that {@link RecursiveComparisonAssert#ignoringCollectionOrder ignoringCollectionOrder} is applied recursively on any nested iterable fields, if this behavior is too generic,1927 * use the more fine grained {@link RecursiveComparisonAssert#ignoringCollectionOrderInFields(String...) ignoringCollectionOrderInFields} or1928 * {@link RecursiveComparisonAssert#ignoringCollectionOrderInFieldsMatchingRegexes(String...) ignoringCollectionOrderInFieldsMatchingRegexes}.1929 *1930 * @param configuration the recursive comparison configuration.1931 *1932 * @return {@code this} assertion object.1933 * @since 3.17.01934 * @see RecursiveComparisonConfiguration1935 */1936 public SELF usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration configuration) {1937 return usingElementComparator(new ConfigurableRecursiveFieldByFieldComparator(configuration));1938 }1939 /**1940 * Enable using a recursive field by field comparison strategy when calling the chained {@link RecursiveComparisonAssert},1941 * <p>1942 * There are differences between this approach and {@link #usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration)}:1943 * <ul>1944 * <li>you can only chain {@link RecursiveComparisonAssert} assertions (basically {@link RecursiveComparisonAssert#isEqualTo(Object) isEqualTo}) and (basically {@link RecursiveComparisonAssert#isNotEqualTo(Object) isNotEqualTo}), no iterable assertions.</li>1945 * <li>{@link RecursiveComparisonAssert#isEqualTo(Object) isEqualTo} assertion error will report all field differences (very detailed).</li>1946 * <li>no comparators registered with {@link AbstractIterableAssert#usingComparatorForType(Comparator, Class)} will be used, you need to register them in chained call like {@link RecursiveComparisonAssert#withComparatorForType(Comparator, Class)}.</li>1947 * </ul>1948 * <p>1949 * If you need to chain iterable assertions using recursive comparisons call {@link #usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration)} instead.1950 * <p>1951 * Example:1952 * <pre><code class='java'> public class Person {1953 * String name;1954 * boolean hasPhd;1955 * }1956 *1957 * public class Doctor {1958 * String name;1959 * boolean hasPhd;1960 * }1961 *1962 * Doctor drSheldon = new Doctor("Sheldon Cooper", true);1963 * Doctor drLeonard = new Doctor("Leonard Hofstadter", true);1964 * Doctor drRaj = new Doctor("Raj Koothrappali", true);1965 *1966 * Person sheldon = new Person("Sheldon Cooper", true);1967 * Person leonard = new Person("Leonard Hofstadter", true);1968 * Person raj = new Person("Raj Koothrappali", true);1969 * Person howard = new Person("Howard Wolowitz", false);1970 *1971 * List&lt;Doctor&gt; doctors = Arrays.asList(drSheldon, drLeonard, drRaj);1972 * List&lt;Person&gt; people = Arrays.asList(sheldon, leonard, raj);1973 *1974 * // assertion succeeds as both lists contains equivalent items in order.1975 * assertThat(doctors).usingRecursiveComparison()1976 * .isEqualTo(people);1977 *1978 * // assertion fails because leonard names are different.1979 * leonard.setName("Leonard Ofstater");1980 * assertThat(doctors).usingRecursiveComparison()1981 * .isEqualTo(people);1982 *1983 * // assertion fails because howard is missing and leonard is not expected.1984 * people = Arrays.asList(howard, sheldon, raj)1985 * assertThat(doctors).usingRecursiveComparison()1986 * .isEqualTo(people);</code></pre>1987 *1988 * A detailed documentation for the recursive comparison is available here: <a href="https://assertj.github.io/doc/#assertj-core-recursive-comparison">https://assertj.github.io/doc/#assertj-core-recursive-comparison</a>.1989 * <p>1990 * The default recursive comparison behavior is {@link RecursiveComparisonConfiguration configured} as follows:1991 * <ul>1992 * <li> different types of iterable can be compared by default, this allows to compare for example an {@code List<Person>} and a {@code LinkedHashSet<PersonDto>}.<br>1993 * This behavior can be turned off by calling {@link RecursiveComparisonAssert#withStrictTypeChecking() withStrictTypeChecking}.</li>1994 * <li>overridden equals methods are used in the comparison (unless stated otherwise - see <a href="https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals">https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals</a>)</li>1995 * <li>the following types are compared with these comparators:1996 * <ul>1997 * <li>{@code java.lang.Double}: {@code DoubleComparator} with precision of 1.0E-15</li>1998 * <li>{@code java.lang.Float}: {@code FloatComparator }with precision of 1.0E-6</li>1999 * </ul>2000 * </li>2001 * </ul>2002 * <p>2003 * Another point worth mentioning: <b>elements order does matter if the expected iterable is ordered</b>, for example comparing a {@code Set<Person>} to a {@code List<Person>} fails as {@code List} is ordered and {@code Set} is not.<br>2004 * The ordering can be ignored by calling {@link RecursiveComparisonAssert#ignoringCollectionOrder ignoringCollectionOrder} allowing ordered/unordered iterable comparison, note that {@link RecursiveComparisonAssert#ignoringCollectionOrder ignoringCollectionOrder} is applied recursively on any nested iterable fields, if this behavior is too generic,2005 * use the more fine grained {@link RecursiveComparisonAssert#ignoringCollectionOrderInFields(String...) ignoringCollectionOrderInFields} or2006 * {@link RecursiveComparisonAssert#ignoringCollectionOrderInFieldsMatchingRegexes(String...) ignoringCollectionOrderInFieldsMatchingRegexes}.2007 * <p>2008 * At the moment, only `isEqualTo` can be chained after this method but there are plans to provide assertions.2009 *2010 * @return a new {@link RecursiveComparisonAssert} instance2011 * @see RecursiveComparisonConfiguration RecursiveComparisonConfiguration2012 */2013 @Override2014 @Beta2015 public RecursiveComparisonAssert<?> usingRecursiveComparison() {2016 // overridden for javadoc and to make this method public2017 return super.usingRecursiveComparison();2018 }2019 /**2020 * Same as {@link #usingRecursiveComparison()} but allows to specify your own {@link RecursiveComparisonConfiguration}.2021 * <p>2022 * Another difference is that any comparators previously registered with {@link AbstractIterableAssert#usingComparatorForType(Comparator, Class)} will be used in the comparison.2023 *2024 * @param recursiveComparisonConfiguration the {@link RecursiveComparisonConfiguration} used in the chained {@link RecursiveComparisonAssert#isEqualTo(Object) isEqualTo} assertion.2025 *2026 * @return a new {@link RecursiveComparisonAssert} instance built with the given {@link RecursiveComparisonConfiguration}.2027 */2028 @Override2029 public RecursiveComparisonAssert<?> usingRecursiveComparison(RecursiveComparisonConfiguration recursiveComparisonConfiguration) {2030 return super.usingRecursiveComparison(recursiveComparisonConfiguration).withTypeComparators(comparatorsByType);2031 }2032 /**2033 * Use field/property by field/property comparison on the <b>given fields/properties only</b> (including inherited2034 * fields/properties) instead of relying on actual type A <code>equals</code> method to compare group elements for2035 * incoming assertion checks. Private fields are included but this can be disabled using2036 * {@link Assertions#setAllowExtractingPrivateFields(boolean)}.2037 * <p>2038 * This can be handy if <code>equals</code> method of the objects to compare does not suit you.2039 * <p>2040 * You can specify a custom comparator per name or type of element field with2041 * {@link #usingComparatorForElementFieldsWithNames(Comparator, String...)}2042 * and {@link #usingComparatorForElementFieldsWithType(Comparator, Class)}.2043 * <p>2044 * Note that the comparison is <b>not</b> recursive, if one of the fields/properties is an Object, it will be compared2045 * to the other field/property using its <code>equals</code> method.2046 * </p>2047 * Example:2048 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);2049 * TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);2050 *2051 * // frodo and sam both are hobbits, so they are equals when comparing only race2052 * assertThat(newArrayList(frodo)).usingElementComparatorOnFields("race").contains(sam); // OK2053 *2054 * // ... but not when comparing both name and race2055 * assertThat(newArrayList(frodo)).usingElementComparatorOnFields("name", "race").contains(sam); // FAIL</code></pre>2056 *2057 * @param fields the fields/properties to compare using element comparators2058 * @return {@code this} assertion object.2059 */2060 @CheckReturnValue2061 public SELF usingElementComparatorOnFields(String... fields) {2062 return usingExtendedByTypesElementComparator(new OnFieldsComparator(comparatorsForElementPropertyOrFieldNames,2063 getComparatorsForElementPropertyOrFieldTypes(),2064 fields));2065 }2066 protected SELF usingComparisonStrategy(ComparisonStrategy comparisonStrategy) {2067 iterables = new Iterables(comparisonStrategy);2068 return myself;2069 }2070 /**2071 * Use field/property by field/property comparison on all fields/properties <b>except</b> the given ones (including inherited2072 * fields/properties) instead of relying on actual type A <code>equals</code> method to compare group elements for2073 * incoming assertion checks. Private fields are included but this can be disabled using2074 * {@link Assertions#setAllowExtractingPrivateFields(boolean)}.2075 * <p>2076 * This can be handy if <code>equals</code> method of the objects to compare does not suit you.2077 * <p>2078 * You can specify a custom comparator per name or type of element field with2079 * {@link #usingComparatorForElementFieldsWithNames(Comparator, String...)}2080 * and {@link #usingComparatorForElementFieldsWithType(Comparator, Class)}.2081 * <p>2082 * Note that the comparison is <b>not</b> recursive, if one of the fields/properties is an Object, it will be compared2083 * to the other field/property using its <code>equals</code> method.2084 * </p>2085 * Example:2086 * <pre><code class='java'> TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);2087 * TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);2088 *2089 * // frodo and sam both are hobbits, so they are equals when comparing only race (i.e. ignoring all other fields)2090 * assertThat(newArrayList(frodo)).usingElementComparatorIgnoringFields("name", "age").contains(sam); // OK2091 *2092 * // ... but not when comparing both name and race2093 * assertThat(newArrayList(frodo)).usingElementComparatorIgnoringFields("age").contains(sam); // FAIL</code></pre>2094 *2095 * @param fields the fields/properties to compare using element comparators2096 * @return {@code this} assertion object.2097 */2098 @CheckReturnValue2099 public SELF usingElementComparatorIgnoringFields(String... fields) {2100 return usingExtendedByTypesElementComparator(new IgnoringFieldsComparator(comparatorsForElementPropertyOrFieldNames,2101 getComparatorsForElementPropertyOrFieldTypes(),2102 fields));2103 }2104 /**2105 * Enable hexadecimal representation of Iterable elements instead of standard representation in error messages.2106 * <p>2107 * It can be useful to better understand what the error was with a more meaningful error message.2108 * <p>2109 * Example2110 * <pre><code class='java'> final List&lt;Byte&gt; bytes = newArrayList((byte) 0x10, (byte) 0x20);</code></pre>2111 *2112 * With standard error message:2113 * <pre><code class='java'> assertThat(bytes).contains((byte) 0x30);2114 *2115 * Expecting:2116 * &lt;[16, 32]&gt;2117 * to contain:2118 * &lt;[48]&gt;2119 * but could not find:2120 * &lt;[48]&gt;</code></pre>2121 *2122 * With Hexadecimal error message:2123 * <pre><code class='java'> assertThat(bytes).inHexadecimal().contains((byte) 0x30);2124 *2125 * Expecting:2126 * &lt;[0x10, 0x20]&gt;2127 * to contain:2128 * &lt;[0x30]&gt;2129 * but could not find:2130 * &lt;[0x30]&gt;</code></pre>2131 *2132 * @return {@code this} assertion object.2133 */2134 @Override2135 @CheckReturnValue2136 public SELF inHexadecimal() {2137 return super.inHexadecimal();2138 }2139 /**2140 * Enable binary representation of Iterable elements instead of standard representation in error messages.2141 * <p>2142 * Example:2143 * <pre><code class='java'> final List&lt;Byte&gt; bytes = newArrayList((byte) 0x10, (byte) 0x20);</code></pre>2144 *2145 * With standard error message:2146 * <pre><code class='java'> assertThat(bytes).contains((byte) 0x30);2147 *2148 * Expecting:2149 * &lt;[16, 32]&gt;2150 * to contain:2151 * &lt;[48]&gt;2152 * but could not find:2153 * &lt;[48]&gt;</code></pre>2154 *2155 * With binary error message:2156 * <pre><code class='java'> assertThat(bytes).inBinary().contains((byte) 0x30);2157 *2158 * Expecting:2159 * &lt;[0b00010000, 0b00100000]&gt;2160 * to contain:2161 * &lt;[0b00110000]&gt;2162 * but could not find:2163 * &lt;[0b00110000]&gt;</code></pre>2164 *2165 * @return {@code this} assertion object.2166 */2167 @Override2168 @CheckReturnValue2169 public SELF inBinary() {2170 return super.inBinary();2171 }2172 /**2173 * Filters the iterable under test keeping only elements having a property or field equal to {@code expectedValue}, the2174 * property/field is specified by {@code propertyOrFieldName} parameter.2175 * <p>2176 * The filter first tries to get the value from a property (named {@code propertyOrFieldName}), if no such property2177 * exists it tries to read the value from a field. Reading private fields is supported by default, this can be2178 * globally disabled by calling {@link Assertions#setAllowExtractingPrivateFields(boolean)2179 * Assertions.setAllowExtractingPrivateFields(false)}.2180 * <p>2181 * When reading <b>nested</b> property/field, if an intermediate value is null the whole nested property/field is2182 * considered to be null, thus reading "address.street.name" value will return null if "street" value is null.2183 * <p>2184 *2185 * As an example, let's check all employees 800 years old (yes, special employees):2186 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);2187 * Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);2188 * Employee luke = new Employee(3L, new Name("Luke", "Skywalker"), 26);2189 * Employee noname = new Employee(4L, null, 50);2190 *2191 * List&lt;Employee&gt; employees = newArrayList(yoda, luke, obiwan, noname);2192 *2193 * assertThat(employees).filteredOn("age", 800)2194 * .containsOnly(yoda, obiwan);</code></pre>2195 *2196 * Nested properties/fields are supported:2197 * <pre><code class='java'> // Name is bean class with 'first' and 'last' String properties2198 *2199 * // name is null for noname =&gt; it does not match the filter on "name.first"2200 * assertThat(employees).filteredOn("name.first", "Luke")2201 * .containsOnly(luke);2202 *2203 * assertThat(employees).filteredOn("name.last", "Vader")2204 * .isEmpty();</code></pre>2205 * <p>2206 * If you want to filter on null value, use {@link #filteredOnNull(String)} as Java will resolve the call to2207 * {@link #filteredOn(String, FilterOperator)} instead of this method.2208 * <p>2209 * An {@link IntrospectionError} is thrown if the given propertyOrFieldName can't be found in one of the iterable2210 * elements.2211 * <p>2212 * You can chain filters:2213 * <pre><code class='java'> // fellowshipOfTheRing is a list of TolkienCharacter having race and name fields2214 * // 'not' filter is statically imported from Assertions.not2215 *2216 * assertThat(fellowshipOfTheRing).filteredOn("race.name", "Man")2217 * .filteredOn("name", not("Boromir"))2218 * .containsOnly(aragorn);</code></pre>2219 *2220 * If you need more complex filter, use {@link #filteredOn(Predicate)} or {@link #filteredOn(Condition)}.2221 *2222 * @param propertyOrFieldName the name of the property or field to read2223 * @param expectedValue the value to compare element's property or field with2224 * @return a new assertion object with the filtered iterable under test2225 * @throws IllegalArgumentException if the given propertyOrFieldName is {@code null} or empty.2226 * @throws IntrospectionError if the given propertyOrFieldName can't be found in one of the iterable elements.2227 */2228 @CheckReturnValue2229 public SELF filteredOn(String propertyOrFieldName, Object expectedValue) {2230 Filters<? extends ELEMENT> filter = filter((Iterable<? extends ELEMENT>) actual);2231 Iterable<? extends ELEMENT> filteredIterable = filter.with(propertyOrFieldName, expectedValue).get();2232 return newAbstractIterableAssert(filteredIterable).withAssertionState(myself);2233 }2234 /**2235 * Filters the iterable under test keeping only elements whose property or field specified by2236 * {@code propertyOrFieldName} is null.2237 * <p>2238 * The filter first tries to get the value from a property (named {@code propertyOrFieldName}), if no such property2239 * exists it tries to read the value from a field. Reading private fields is supported by default, this can be2240 * globally disabled by calling {@link Assertions#setAllowExtractingPrivateFields(boolean)2241 * Assertions.setAllowExtractingPrivateFields(false)}.2242 * <p>2243 * When reading <b>nested</b> property/field, if an intermediate value is null the whole nested property/field is2244 * considered to be null, thus reading "address.street.name" value will return null if "street" value is null.2245 * <p>2246 * As an example, let's check all employees 800 years old (yes, special employees):2247 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);2248 * Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);2249 * Employee luke = new Employee(3L, new Name("Luke", "Skywalker"), 26);2250 * Employee noname = new Employee(4L, null, 50);2251 *2252 * List&lt;Employee&gt; employees = newArrayList(yoda, luke, obiwan, noname);2253 *2254 * assertThat(employees).filteredOnNull("name")2255 * .containsOnly(noname);</code></pre>2256 *2257 * Nested properties/fields are supported:2258 * <pre><code class='java'> // Name is bean class with 'first' and 'last' String properties2259 *2260 * assertThat(employees).filteredOnNull("name.last")2261 * .containsOnly(yoda, obiwan, noname);</code></pre>2262 *2263 * An {@link IntrospectionError} is thrown if the given propertyOrFieldName can't be found in one of the iterable2264 * elements.2265 * <p>2266 * If you need more complex filter, use {@link #filteredOn(Predicate)} or {@link #filteredOn(Condition)}.2267 *2268 * @param propertyOrFieldName the name of the property or field to read2269 * @return a new assertion object with the filtered iterable under test2270 * @throws IntrospectionError if the given propertyOrFieldName can't be found in one of the iterable elements.2271 */2272 @CheckReturnValue2273 public SELF filteredOnNull(String propertyOrFieldName) {2274 // can't call filteredOn(String propertyOrFieldName, null) as it does not work with soft assertions proxying2275 // mechanism, it would lead to double proxying which is not handle properly (improvements needed in our proxy mechanism)2276 Filters<? extends ELEMENT> filter = filter((Iterable<? extends ELEMENT>) actual);2277 Iterable<? extends ELEMENT> filteredIterable = filter.with(propertyOrFieldName, null).get();2278 return newAbstractIterableAssert(filteredIterable).withAssertionState(myself);2279 }2280 /**2281 * Filters the iterable under test keeping only elements having a property or field matching the filter expressed with2282 * the {@link FilterOperator}, the property/field is specified by {@code propertyOrFieldName} parameter.2283 * <p>2284 * The existing filters are :2285 * <ul>2286 * <li> {@link Assertions#not(Object) not(Object)}</li>2287 * <li> {@link Assertions#in(Object...) in(Object...)}</li>2288 * <li> {@link Assertions#notIn(Object...) notIn(Object...)}</li>2289 * </ul>2290 * <p>2291 * Whatever filter is applied, it first tries to get the value from a property (named {@code propertyOrFieldName}), if2292 * no such property exists it tries to read the value from a field. Reading private fields is supported by default,2293 * this can be globally disabled by calling {@link Assertions#setAllowExtractingPrivateFields(boolean)2294 * Assertions.setAllowExtractingPrivateFields(false)}.2295 * <p>2296 * When reading <b>nested</b> property/field, if an intermediate value is null the whole nested property/field is2297 * considered to be null, thus reading "address.street.name" value will return null if "street" value is null.2298 * <p>2299 *2300 * As an example, let's check stuff on some special employees :2301 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);2302 * Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);2303 * Employee luke = new Employee(3L, new Name("Luke", "Skywalker"), 26);2304 *2305 * List&lt;Employee&gt; employees = newArrayList(yoda, luke, obiwan, noname);2306 *2307 * // 'not' filter is statically imported from Assertions.not2308 * assertThat(employees).filteredOn("age", not(800))2309 * .containsOnly(luke);2310 *2311 * // 'in' filter is statically imported from Assertions.in2312 * // Name is bean class with 'first' and 'last' String properties2313 * assertThat(employees).filteredOn("name.first", in("Yoda", "Luke"))2314 * .containsOnly(yoda, luke);2315 *2316 * // 'notIn' filter is statically imported from Assertions.notIn2317 * assertThat(employees).filteredOn("name.first", notIn("Yoda", "Luke"))2318 * .containsOnly(obiwan);</code></pre>2319 *2320 * An {@link IntrospectionError} is thrown if the given propertyOrFieldName can't be found in one of the iterable2321 * elements.2322 * <p>2323 * Note that combining filter operators is not supported, thus the following code is not correct:2324 * <pre><code class='java'> // Combining filter operators like not(in(800)) is NOT supported2325 * // -&gt; throws UnsupportedOperationException2326 * assertThat(employees).filteredOn("age", not(in(800)))2327 * .contains(luke);</code></pre>2328 * <p>2329 * You can chain filters:2330 * <pre><code class='java'> // fellowshipOfTheRing is a list of TolkienCharacter having race and name fields2331 * // 'not' filter is statically imported from Assertions.not2332 *2333 * assertThat(fellowshipOfTheRing).filteredOn("race.name", "Man")2334 * .filteredOn("name", not("Boromir"))2335 * .containsOnly(aragorn);</code></pre>2336 *2337 * If you need more complex filter, use {@link #filteredOn(Predicate)} or {@link #filteredOn(Condition)}.2338 *2339 * @param propertyOrFieldName the name of the property or field to read2340 * @param filterOperator the filter operator to apply2341 * @return a new assertion object with the filtered iterable under test2342 * @throws IllegalArgumentException if the given propertyOrFieldName is {@code null} or empty.2343 */2344 @CheckReturnValue2345 public SELF filteredOn(String propertyOrFieldName, FilterOperator<?> filterOperator) {2346 checkNotNull(filterOperator);2347 Filters<? extends ELEMENT> filter = filter((Iterable<? extends ELEMENT>) actual).with(propertyOrFieldName);2348 filterOperator.applyOn(filter);2349 return newAbstractIterableAssert(filter.get()).withAssertionState(myself);2350 }2351 /**2352 * Filters the iterable under test keeping only elements matching the given {@link Condition}.2353 * <p>2354 * If you prefer {@link Predicate} over {@link Condition}, use {@link #filteredOn(Predicate)}.2355 * <p>2356 * Example : check old employees whose age &gt; 100:2357 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);2358 * Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);2359 * Employee luke = new Employee(3L, new Name("Luke", "Skywalker"), 26);2360 * Employee noname = new Employee(4L, null, 50);2361 *2362 * List&lt;Employee&gt; employees = newArrayList(yoda, luke, obiwan, noname);2363 *2364 * // old employee condition, "old employees" describes the condition in error message2365 * // you just have to implement 'matches' method2366 * Condition&lt;Employee&gt; oldEmployees = new Condition&lt;Employee&gt;("old employees") {2367 * {@literal @}Override2368 * public boolean matches(Employee employee) {2369 * return employee.getAge() &gt; 100;2370 * }2371 * };2372 * }2373 * assertThat(employees).filteredOn(oldEmployees)2374 * .containsOnly(yoda, obiwan);</code></pre>2375 *2376 * You can combine {@link Condition} with condition operator like {@link Not}:2377 * <pre><code class='java'> // 'not' filter is statically imported from Assertions.not2378 * assertThat(employees).filteredOn(not(oldEmployees))2379 * .contains(luke, noname);</code></pre>2380 *2381 * @param condition the filter condition / predicate2382 * @return a new assertion object with the filtered iterable under test2383 * @throws IllegalArgumentException if the given condition is {@code null}.2384 */2385 @CheckReturnValue2386 public SELF filteredOn(Condition<? super ELEMENT> condition) {2387 Filters<? extends ELEMENT> filter = filter((Iterable<? extends ELEMENT>) actual);2388 Iterable<? extends ELEMENT> filteredIterable = filter.being(condition).get();2389 return newAbstractIterableAssert(filteredIterable).withAssertionState(myself);2390 }2391 /**2392 * Filters the iterable under test keeping only elements for which the result of the {@code function} is equal to {@code expectedValue}.2393 * <p>2394 * It allows to filter elements more safely than by using {@link #filteredOn(String, Object)} as it doesn't utilize introspection.2395 * <p>2396 * As an example, let's check all employees 800 years old (yes, special employees):2397 * <pre><code class='java'> Employee yoda = new Employee(1L, new Name("Yoda"), 800);2398 * Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);2399 * Employee luke = new Employee(3L, new Name("Luke", "Skywalker"), 26);2400 * Employee noname = new Employee(4L, null, 50);2401 *2402 * List&lt;Employee&gt; employees = newArrayList(yoda, luke, obiwan, noname);2403 *2404 * assertThat(employees).filteredOn(Employee::getAge, 800)2405 * .containsOnly(yoda, obiwan);2406 *2407 * assertThat(employees).filteredOn(e -&gt; e.getName(), null)2408 * .containsOnly(noname);</code></pre>2409 *2410 * If you need more complex filter, use {@link #filteredOn(Predicate)} or {@link #filteredOn(Condition)}.2411 *2412 * @param <T> result type of the filter function2413 * @param function the filter function2414 * @param expectedValue the expected value of the filter function2415 * @return a new assertion object with the filtered iterable under test2416 * @throws IllegalArgumentException if the given function is {@code null}.2417 * @since 3.17.02418 */2419 @CheckReturnValue2420 public <T> SELF filteredOn(Function<? super ELEMENT, T> function, T expectedValue) {2421 checkArgument(function != null, "The filter function should not be null");2422 // call internalFilteredOn to avoid double proxying in soft assertions2423 return internalFilteredOn(element -> java.util.Objects.equals(function.apply(element), expectedValue));2424 }2425 /**2426 * Filters the iterable under test keeping only elements matching the given assertions specified with a {@link Consumer}.2427 * <p>2428 * Example : check young hobbits whose age &lt; 34:2429 *2430 * <pre><code class='java'> TolkienCharacter pippin = new TolkienCharacter("Pippin", 28, HOBBIT);2431 * TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);2432 * TolkienCharacter merry = new TolkienCharacter("Merry", 36, HOBBIT);2433 * TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);2434 *2435 * List&lt;TolkienCharacter&gt; hobbits = list(frodo, sam, merry, pippin);2436 *2437 * assertThat(hobbits).filteredOnAssertions(hobbit -&gt; assertThat(hobbit.age).isLessThan(34))2438 * .containsOnly(frodo, pippin);</code></pre>2439 *2440 * @param elementAssertions containing AssertJ assertions to filter on2441 * @return a new assertion object with the filtered iterable under test2442 * @throws IllegalArgumentException if the given predicate is {@code null}.2443 * @since 3.11.02444 */2445 public SELF filteredOnAssertions(Consumer<? super ELEMENT> elementAssertions) {2446 checkArgument(elementAssertions != null, "The element assertions should not be null");2447 List<? extends ELEMENT> filteredIterable = stream(actual.spliterator(), false).filter(byPassingAssertions(elementAssertions))2448 .collect(toList());2449 return newAbstractIterableAssert(filteredIterable).withAssertionState(myself);2450 }2451 // navigable assertions2452 /**2453 * Navigate and allow to perform assertions on the first element of the {@link Iterable} under test.2454 * <p>2455 * By default available assertions after {@code first()} are {@code Object} assertions, it is possible though to2456 * get more specific assertions if you create {@code IterableAssert} with either:2457 * <ul>2458 * <li>the element assert class, see: {@link Assertions#assertThat(Iterable, Class) assertThat(Iterable, element assert class)}</li>2459 * <li>an assert factory used that knows how to create elements assertion, see: {@link Assertions#assertThat(Iterable, AssertFactory) assertThat(Iterable, element assert factory)}</li>2460 * </ul>2461 * <p>2462 * Example: default {@code Object} assertions2463 * <pre><code class='java'> // default iterable assert =&gt; element assert is ObjectAssert2464 * Iterable&lt;TolkienCharacter&gt; hobbits = newArrayList(frodo, sam, pippin);2465 *2466 * // assertion succeeds, only Object assertions are available after first()2467 * assertThat(hobbits).first()2468 * .isEqualTo(frodo);2469 *2470 * // assertion fails2471 * assertThat(hobbits).first()2472 * .isEqualTo(pippin);</code></pre>2473 * <p>2474 * If you have created the Iterable assertion using an {@link AssertFactory} or the element assert class,2475 * you will be able to chain {@code first()} with more specific typed assertion.2476 * <p>2477 * Example: use of {@code String} assertions after {@code first()}2478 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2479 *2480 * // assertion succeeds2481 * // String assertions are available after first()2482 * assertThat(hobbits, StringAssert.class).first()2483 * .startsWith("Fro")2484 * .endsWith("do");2485 * // assertion fails2486 * assertThat(hobbits, StringAssert.class).first()2487 * .startsWith("Pip");</code></pre>2488 *2489 * @return the assertion on the first element2490 * @throws AssertionError if the actual {@link Iterable} is empty.2491 * @since 2.5.0 / 3.5.02492 * @see #first(InstanceOfAssertFactory)2493 */2494 @CheckReturnValue2495 public ELEMENT_ASSERT first() {2496 return internalFirst();2497 }2498 /**2499 * Navigate and allow to perform assertions on the first element of the {@link Iterable} under test.2500 * <p>2501 * The {@code assertFactory} parameter allows to specify an {@link InstanceOfAssertFactory}, which is used to get the2502 * assertions narrowed to the factory type.2503 * <p>2504 * Example: use of {@code String} assertions after {@code first(as(InstanceOfAssertFactories.STRING)}2505 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2506 *2507 * // assertion succeeds2508 * assertThat(hobbits).first(as(InstanceOfAssertFactories.STRING))2509 * .startsWith("Fro")2510 * .endsWith("do");2511 * // assertion fails2512 * assertThat(hobbits).first(as(InstanceOfAssertFactories.STRING))2513 * .startsWith("Pip");2514 * // assertion fails because of wrong factory type2515 * assertThat(hobbits).first(as(InstanceOfAssertFactories.INTEGER))2516 * .isZero();</code></pre>2517 *2518 * @param <ASSERT> the type of the resulting {@code Assert}2519 * @param assertFactory the factory which verifies the type and creates the new {@code Assert}2520 * @return a new narrowed {@link Assert} instance for assertions chaining on the first element2521 * @throws AssertionError if the actual {@link Iterable} is empty.2522 * @throws NullPointerException if the given factory is {@code null}2523 * @since 3.14.02524 */2525 @CheckReturnValue2526 public <ASSERT extends AbstractAssert<?, ?>> ASSERT first(InstanceOfAssertFactory<?, ASSERT> assertFactory) {2527 return internalFirst().asInstanceOf(assertFactory);2528 }2529 private ELEMENT_ASSERT internalFirst() {2530 isNotEmpty();2531 return toAssert(actual.iterator().next(), navigationDescription("check first element"));2532 }2533 /**2534 * Navigate and allow to perform assertions on the last element of the {@link Iterable} under test.2535 * <p>2536 * By default available assertions after {@code last()} are {@code Object} assertions, it is possible though to2537 * get more specific assertions if you create {@code IterableAssert} with either:2538 * <ul>2539 * <li>the element assert class, see: {@link Assertions#assertThat(Iterable, Class) assertThat(Iterable, element assert class)}</li>2540 * <li>an assert factory used that knows how to create elements assertion, see: {@link Assertions#assertThat(Iterable, AssertFactory) assertThat(Iterable, element assert factory)}</li>2541 * </ul>2542 * <p>2543 * Example: default {@code Object} assertions2544 * <pre><code class='java'> // default iterable assert =&gt; element assert is ObjectAssert2545 * Iterable&lt;TolkienCharacter&gt; hobbits = newArrayList(frodo, sam, pippin);2546 *2547 * // assertion succeeds, only Object assertions are available after last()2548 * assertThat(hobbits).last()2549 * .isEqualTo(pippin);2550 *2551 * // assertion fails2552 * assertThat(hobbits).last()2553 * .isEqualTo(frodo);</code></pre>2554 * <p>2555 * If you have created the Iterable assertion using an {@link AssertFactory} or the element assert class,2556 * you will be able to chain {@code last()} with more specific typed assertion.2557 * <p>2558 * Example: use of {@code String} assertions after {@code last()}2559 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2560 *2561 * // assertion succeeds2562 * // String assertions are available after last()2563 * assertThat(hobbits, StringAssert.class).last()2564 * .startsWith("Pi")2565 * .endsWith("in");2566 * // assertion fails2567 * assertThat(hobbits, StringAssert.class).last()2568 * .startsWith("Fro");</code></pre>2569 *2570 * @return the assertion on the last element2571 * @throws AssertionError if the actual {@link Iterable} is empty.2572 * @since 2.5.0 / 3.5.02573 * @see #last(InstanceOfAssertFactory)2574 */2575 @CheckReturnValue2576 public ELEMENT_ASSERT last() {2577 return internalLast();2578 }2579 /**2580 * Navigate and allow to perform assertions on the last element of the {@link Iterable} under test.2581 * <p>2582 * The {@code assertFactory} parameter allows to specify an {@link InstanceOfAssertFactory}, which is used to get the2583 * assertions narrowed to the factory type.2584 * <p>2585 * Example: use of {@code String} assertions after {@code last(as(InstanceOfAssertFactories.STRING)}2586 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2587 *2588 * // assertion succeeds2589 * assertThat(hobbits).last(as(InstanceOfAssertFactories.STRING))2590 * .startsWith("Pip")2591 * .endsWith("pin");2592 * // assertion fails2593 * assertThat(hobbits).last(as(InstanceOfAssertFactories.STRING))2594 * .startsWith("Fro");2595 * // assertion fails because of wrong factory type2596 * assertThat(hobbits).last(as(InstanceOfAssertFactories.INTEGER))2597 * .isZero();</code></pre>2598 *2599 * @param <ASSERT> the type of the resulting {@code Assert}2600 * @param assertFactory the factory which verifies the type and creates the new {@code Assert}2601 * @return a new narrowed {@link Assert} instance for assertions chaining on the last element2602 * @throws AssertionError if the actual {@link Iterable} is empty.2603 * @throws NullPointerException if the given factory is {@code null}2604 * @since 3.14.02605 */2606 @CheckReturnValue2607 public <ASSERT extends AbstractAssert<?, ?>> ASSERT last(InstanceOfAssertFactory<?, ASSERT> assertFactory) {2608 return internalLast().asInstanceOf(assertFactory);2609 }2610 private ELEMENT_ASSERT internalLast() {2611 isNotEmpty();2612 return toAssert(lastElement(), navigationDescription("check last element"));2613 }2614 private ELEMENT lastElement() {2615 if (actual instanceof List) {2616 @SuppressWarnings("unchecked")2617 List<? extends ELEMENT> list = (List<? extends ELEMENT>) actual;2618 return list.get(list.size() - 1);2619 }2620 Iterator<? extends ELEMENT> actualIterator = actual.iterator();2621 ELEMENT last = actualIterator.next();2622 while (actualIterator.hasNext()) {2623 last = actualIterator.next();2624 }2625 return last;2626 }2627 /**2628 * Navigate and allow to perform assertions on the chosen element of the {@link Iterable} under test.2629 * <p>2630 * By default available assertions after {@code element(index)} are {@code Object} assertions, it is possible though to2631 * get more specific assertions if you create {@code IterableAssert} with either:2632 * <ul>2633 * <li>the element assert class, see: {@link Assertions#assertThat(Iterable, Class) assertThat(Iterable, element assert class)}</li>2634 * <li>an assert factory used that knows how to create elements assertion, see: {@link Assertions#assertThat(Iterable, AssertFactory) assertThat(Iterable, element assert factory)}</li>2635 * </ul>2636 * <p>2637 * Example: default {@code Object} assertions2638 * <pre><code class='java'> // default iterable assert =&gt; element assert is ObjectAssert2639 * Iterable&lt;TolkienCharacter&gt; hobbits = newArrayList(frodo, sam, pippin);2640 *2641 * // assertion succeeds, only Object assertions are available after element(index)2642 * assertThat(hobbits).element(1)2643 * .isEqualTo(sam);2644 *2645 * // assertion fails2646 * assertThat(hobbits).element(1)2647 * .isEqualTo(pippin);</code></pre>2648 * <p>2649 * If you have created the Iterable assertion using an {@link AssertFactory} or the element assert class,2650 * you will be able to chain {@code element(index)} with more specific typed assertion.2651 * <p>2652 * Example: use of {@code String} assertions after {@code element(index)}2653 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2654 *2655 * // assertion succeeds2656 * // String assertions are available after element(index)2657 * assertThat(hobbits, StringAssert.class).element(1)2658 * .startsWith("Sa")2659 * .endsWith("am");2660 * // assertion fails2661 * assertThat(hobbits, StringAssert.class).element(1)2662 * .startsWith("Fro");</code></pre>2663 *2664 * @param index the element's index2665 * @return the assertion on the given element2666 * @throws AssertionError if the given index is out of bound.2667 * @since 2.5.0 / 3.5.02668 * @see #element(int, InstanceOfAssertFactory)2669 */2670 @CheckReturnValue2671 public ELEMENT_ASSERT element(int index) {2672 return internalElement(index);2673 }2674 /**2675 * Navigate and allow to perform assertions on the chosen element of the {@link Iterable} under test.2676 * <p>2677 * The {@code assertFactory} parameter allows to specify an {@link InstanceOfAssertFactory}, which is used to get the2678 * assertions narrowed to the factory type.2679 * <p>2680 * Example: use of {@code String} assertions after {@code element(index, as(InstanceOfAssertFactories.STRING)}2681 * <pre><code class='java'> Iterable&lt;String&gt; hobbits = newArrayList("Frodo", "Sam", "Pippin");2682 *2683 * // assertion succeeds2684 * assertThat(hobbits).element(1, as(InstanceOfAssertFactories.STRING))2685 * .startsWith("Sa")2686 * .endsWith("am");2687 * // assertion fails2688 * assertThat(hobbits).element(1, as(InstanceOfAssertFactories.STRING))2689 * .startsWith("Fro");2690 * // assertion fails because of wrong factory type2691 * assertThat(hobbits).element(1, as(InstanceOfAssertFactories.INTEGER))2692 * .isZero();</code></pre>2693 *2694 * @param <ASSERT> the type of the resulting {@code Assert}2695 * @param index the element's index2696 * @param assertFactory the factory which verifies the type and creates the new {@code Assert}2697 * @return a new narrowed {@link Assert} instance for assertions chaining on the element at the given index2698 * @throws AssertionError if the given index is out of bound.2699 * @throws NullPointerException if the given factory is {@code null}2700 * @since 3.14.02701 */2702 @CheckReturnValue2703 public <ASSERT extends AbstractAssert<?, ?>> ASSERT element(int index, InstanceOfAssertFactory<?, ASSERT> assertFactory) {2704 return internalElement(index).asInstanceOf(assertFactory);2705 }2706 private ELEMENT_ASSERT internalElement(int index) {2707 isNotEmpty();2708 assertThat(index).describedAs(navigationDescription("check index validity"))2709 .isBetween(0, IterableUtil.sizeOf(actual) - 1);2710 ELEMENT elementAtIndex;2711 if (actual instanceof List) {2712 @SuppressWarnings("unchecked")2713 List<? extends ELEMENT> list = (List<? extends ELEMENT>) actual;2714 elementAtIndex = list.get(index);2715 } else {2716 Iterator<? extends ELEMENT> actualIterator = actual.iterator();2717 for (int i = 0; i < index; i++) {2718 actualIterator.next();2719 }2720 elementAtIndex = actualIterator.next();2721 }2722 return toAssert(elementAtIndex, navigationDescription("element at index " + index));2723 }2724 /**2725 * Verifies that the {@link Iterable} under test contains a single element and allows to perform assertions that element.2726 * <p>2727 * This is a shorthand for <code>hasSize(1).first()</code>.2728 * <p>2729 * By default available assertions after {@code singleElement()} are {@code Object} assertions, it is possible though to2730 * get more specific assertions if you create {@code IterableAssert} with either:2731 * <ul>2732 * <li>the element assert class, see: {@link Assertions#assertThat(Iterable, Class) assertThat(Iterable, element assert class)}</li>2733 * <li>an assert factory used that knows how to create elements assertion, see: {@link Assertions#assertThat(Iterable, AssertFactory) assertThat(Iterable, element assert factory)}</li>2734 * <li>the general <code>assertThat(Iterable)</code> and narrow down the single element with an assert factory, see: {@link #singleElement(InstanceOfAssertFactory) singleElement(element assert factory)}</li>2735 * </ul>2736 * <p>2737 * Example: default {@code Object} assertions2738 * <pre><code class='java'> List&lt;String&gt; babySimpsons = list("Maggie");2739 *2740 * // assertion succeeds, only Object assertions are available after singleElement()2741 * assertThat(babySimpsons).singleElement()2742 * .isEqualTo("Maggie");2743 *2744 * // assertion fails2745 * assertThat(babySimpsons).singleElement()2746 * .isEqualTo("Homer");2747 *2748 * // assertion fails because list contains no elements2749 * assertThat(emptyList()).singleElement();2750 *2751 *2752 * // assertion fails because list contains more than one element2753 * List&lt;String&gt; simpsons = list("Homer", "Marge", "Lisa", "Bart", "Maggie");2754 * assertThat(simpsons).singleElement();</code></pre>2755 * <p>2756 * If you have created the Iterable assertion using an {@link AssertFactory} or the element assert class,2757 * you will be able to chain {@code singleElement()} with more specific typed assertion.2758 * <p>2759 * Example: use of {@code String} assertions after {@code singleElement()}2760 * <pre><code class='java'> List&lt;String&gt; babySimpsons = list("Maggie");2761 *2762 * // assertion succeeds2763 * // String assertions are available after singleElement()2764 * assertThat(babySimpsons, StringAssert.class).singleElement()2765 * .startsWith("Mag");2766 *2767 * // InstanceOfAssertFactories.STRING is an AssertFactory for String assertions2768 * assertThat(babySimpsons, InstanceOfAssertFactories.STRING).singleElement()2769 * .startsWith("Mag");2770 * // better readability with import static InstanceOfAssertFactories.STRING and Assertions.as2771 * assertThat(babySimpsons, as(STRING)).singleElement()2772 * .startsWith("Mag");2773 *2774 * // assertions fail2775 * assertThat(babySimpsons, StringAssert.class).singleElement()2776 * .startsWith("Lis");2777 * // failure as the single element is not an int/Integer2778 * assertThat(babySimpsons, IntegerAssert.class).singleElement()2779 * .startsWith("Lis");</code></pre>2780 *2781 * @return the assertion on the first element2782 * @throws AssertionError if the actual {@link Iterable} does not contain exactly one element.2783 * @since 3.17.02784 * @see #singleElement(InstanceOfAssertFactory)2785 */2786 @CheckReturnValue2787 public ELEMENT_ASSERT singleElement() {2788 return internalSingleElement();2789 }2790 /**2791 * Verifies that the {@link Iterable} under test contains a single element and allows to perform assertions on that element.<br>2792 * The assertions are strongly typed according to the given {@link AssertFactory} parameter.2793 * <p>2794 * This is a shorthand for <code>hasSize(1).first(assertFactory)</code>.2795 * <p>2796 * Example: use of {@code String} assertions after {@code singleElement(as(STRING)}2797 * <pre><code class='java'> import static org.assertj.core.api.InstanceOfAssertFactories.STRING;2798 * import static org.assertj.core.api.InstanceOfAssertFactories.INTEGER;2799 * import static org.assertj.core.api.Assertions.as; // syntactic sugar2800 *2801 * List&lt;String&gt; babySimpsons = list("Maggie");2802 *2803 * // assertion succeeds2804 * assertThat(babySimpsons).singleElement(as(STRING))2805 * .startsWith("Mag");2806 *2807 * // assertion fails2808 * assertThat(babySimpsons).singleElement(as(STRING))2809 * .startsWith("Lis");2810 *2811 * // assertion fails because of wrong factory type2812 * assertThat(babySimpsons).singleElement(as(INTEGER))2813 * .isZero();2814 *2815 * // assertion fails because list contains no elements2816 * assertThat(emptyList()).singleElement(as(STRING));2817 *2818 * // assertion fails because list contains more than one element2819 * List&lt;String&gt; simpsons = list("Homer", "Marge", "Lisa", "Bart", "Maggie");2820 * assertThat(simpsons).singleElement(as(STRING));</code></pre>2821 *2822 * @param <ASSERT> the type of the resulting {@code Assert}2823 * @param assertFactory the factory which verifies the type and creates the new {@code Assert}2824 * @return a new narrowed {@link Assert} instance for assertions chaining on the single element2825 * @throws AssertionError if the actual {@link Iterable} does not contain exactly one element.2826 * @throws NullPointerException if the given factory is {@code null}.2827 * @since 3.17.02828 */2829 @CheckReturnValue2830 public <ASSERT extends AbstractAssert<?, ?>> ASSERT singleElement(InstanceOfAssertFactory<?, ASSERT> assertFactory) {2831 return internalSingleElement().asInstanceOf(assertFactory);2832 }2833 private ELEMENT_ASSERT internalSingleElement() {2834 iterables.assertHasSize(info, actual, 1);2835 return internalFirst();2836 }2837 protected abstract ELEMENT_ASSERT toAssert(ELEMENT value, String description);2838 protected String navigationDescription(String propertyName) {2839 String text = descriptionText();2840 if (Strings.isNullOrEmpty(text)) {2841 text = removeAssert(this.getClass().getSimpleName());2842 }2843 return text + " " + propertyName;2844 }...

singleElement

Using AI Code Generation

1import java.util.Arrays;2import java.util.List;3import org.assertj.core.api.Assertions;4public class SingleElement {5 public static void main(String[] args) {6 List<Integer> list = Arrays.asList(1, 2, 3);7 Assertions.assertThat(list).singleElement().isEqualTo(2);8 }9}

singleElement

Using AI Code Generation

1package org.example;2import java.util.ArrayList;3import java.util.List;4import static org.assertj.core.api.Assertions.assertThat;5public class App {6 public static void main(String[] args) {7 List<String> list = new ArrayList<String>();8 list.add("one");9 list.add("two");10 assertThat(list).singleElement();11 }12}13 at org.example.App.main(App.java:15)14package org.example;15import java.util.ArrayList;16import java.util.List;17import static org.assertj.core.api.Assertions.assertThat;18public class App {19 public static void main(String[] args) {20 List<String> list = new ArrayList<String>();21 list.add("one");22 list.add("two");23 assertThat(list).contains("one");24 }25}26 at org.example.App.main(App.java:15)27package org.example;28import java.util.ArrayList;29import java.util.List;30import static org.assertj.core.api.Assertions.assertThat;31public class App {32 public static void main(String[] args) {33 List<String> list = new ArrayList<String>();34 list.add("one");35 list.add("two");36 assertThat(list).containsOnly("one");37 }38}39 at org.example.App.main(App.java:15)40package org.example;41import java.util.ArrayList;42import java.util.List;43import static org.assertj.core.api.Assertions.assertThat;44public class App {45 public static void main(String[] args) {46 List<String> list = new ArrayList<String>();47 list.add("one");48 list.add("two");49 assertThat(list).containsSequence("one");50 }51}52 at org.example.App.main(App.java

singleElement

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import java.util.ArrayList;3import java.util.List;4public class SingleElement {5 public static void main(String[] args) {6 List<String> list = new ArrayList<>();7 list.add("One");8 list.add("Two");9 list.add("Three");10 list.add("Four");11 Assertions.assertThat(list).singleElement().isEqualTo("One");12 }13}14to contain exactly (and in same order):15Test Case 2: When we use singleElement() method on an empty list16import org.assertj.core.api.Assertions;17import java.util.ArrayList;18import java.util.List;19public class SingleElement {20 public static void main(String[] args) {21 List<String> list = new ArrayList<>();22 Assertions.assertThat(list).singleElement().isEqualTo("One");23 }24}25to contain exactly (and in same order):26Test Case 3: When we use singleElement() method on a list with more than one element27import org.assertj.core.api.Assertions;28import java.util.ArrayList;29import java.util.List;30public class SingleElement {31 public static void main(String[] args) {32 List<String> list = new ArrayList<>();33 list.add("One");34 list.add("Two");35 list.add("Three");36 list.add("Four");37 Assertions.assertThat(list).singleElement().isEqualTo("Two");38 }39}40to contain exactly (and in same order):41Test Case 4: When we use singleElement() method on a list with more than one element and order is not important

singleElement

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.assertj.core.api.AbstractIterableAssert;3import java.util.ArrayList;4import java.util.List;5public class 1 {6 public static void main(String[] args) {7 List<Integer> list = new ArrayList<Integer>();8 list.add(10);9 list.add(20);10 list.add(30);11 AbstractIterableAssert<?, Iterable<?>, Object, ObjectAssert<Object>> assert1 = Assertions.assertThat(list);12 ObjectAssert<Integer> objAssert = assert1.singleElement();13 System.out.println(objAssert);14 }15}

singleElement

Using AI Code Generation

1import org.assertj.core.api.*;2import java.util.*;3public class SingleElement {4 public static void main(String[] args) {5 AbstractIterableAssert<?, Iterable<?>, Object, ObjectAssert<Object>> abstractIterableAssert = Assertions.assertThat(Arrays.asList("Java", "C++", "C#"));6 abstractIterableAssert.singleElement();7 System.out.println("The Iterable has a single element");8 }9}10Recommended Posts: AssertJ | toHaveSize() method in IterableAssert class11AssertJ | toHaveSizeLessThan() method in IterableAssert class12AssertJ | toHaveSizeLessThanOrEqualTo() method in IterableAssert class13AssertJ | toHaveSizeGreaterThan() method in IterableAssert class14AssertJ | toHaveSizeGreaterThanOrEqualTo() method in IterableAssert class15AssertJ | toHaveSizeBetween() method in IterableAssert class16AssertJ | toHaveSameSizeAs() method in IterableAssert class17AssertJ | toHaveSameElementsAs() method in IterableAssert class18AssertJ | toHaveExactlyElementsOfTypes() method in IterableAssert class19AssertJ | toHaveExactlyElementsOfTypesInAnyOrder() method in IterableAssert class20AssertJ | toHaveExactlyOneElementOfType() method in IterableAssert class21AssertJ | toHaveExactlyInAnyOrder() method in IterableAssert class22AssertJ | toHaveExactlyInAnyOrderElementsOf() method in IterableAssert class23AssertJ | toHaveOnlyElementsOfType() method in IterableAssert class24AssertJ | toHaveOnlyElementsOfTypes() method in IterableAssert class25AssertJ | toHaveOnlyOneElementOfType() method in IterableAssert class26AssertJ | toHaveSameSizeAsArray() method in IterableAssert class27AssertJ | toHaveSameSizeAsIterable() method in IterableAssert class28AssertJ | toHaveSameSizeAsMap() method in IterableAssert class29AssertJ | toHaveSameSizeAsObjectArray() method in IterableAssert class30AssertJ | toHaveSameSizeAsPrimitiveArray() method in IterableAssert class

singleElement

Using AI Code Generation

1import org.assertj.core.api.AbstractIterableAssert;2import org.assertj.core.api.Assertions;3public class SingleElement {4 public static void main(String[] args) {5 AbstractIterableAssert<?, ?, String> assertion = Assertions.assertThat(new String[]{"one", "two"});6 String element = assertion.singleElement();7 System.out.println("element = " + element);8 }9}

singleElement

Using AI Code Generation

1package org.example;2import static org.assertj.core.api.Assertions.assertThat;3import java.util.Arrays;4public class App {5 public static void main(String[] args) {6 assertThat(Arrays.asList("one")).singleElement();7 }8}

singleElement

Using AI Code Generation

1import org.assertj.core.api.*;2import java.util.*;3public class 1 {4 public static void main(String[] args) {5 AbstractIterableAssert<?, Iterable<?>> abstractIterableAssert = Assertions.assertThat(Arrays.asList(1, 2, 3));6 abstractIterableAssert.singleElement();7 }8}

singleElement

Using AI Code Generation

1import org.assertj.core.api.Assertions;2public class SingleElementExample {3public static void main(String[] args) {4Iterable<String> iterable = Arrays.asList("one", "two", "three");5Assertions.assertThat(iterable).singleElement().isEqualTo("one");6}7}8public static <T> T assertThat(T actual)9public static <T> T assertThat(T actual, Representation representation)10public static <T> T assertThat(T actual, Extractor<? super T, ?>... valueExtractors)11public static <T> T assertThat(T actual, Consumer<T> requirements)12public static <T> T assertThat(T actual, Condition<? super T> condition)13public static <T> T assertThat(T actual, Condition<? super T> condition, String description, Object... args)

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Most used method in AbstractIterableAssert

• AbstractIterableAssert
• isNullOrEmpty
• isEmpty
• isNotEmpty
• hasSize
• hasSizeGreaterThan
• hasSizeGreaterThanOrEqualTo
• hasSizeLessThan
• hasSizeLessThanOrEqualTo
• hasSizeBetween
• hasOnlyOneElementSatisfying
• hasSameSizeAs
• contains
• containsForProxy
• containsOnly
• containsOnlyForProxy
• containsOnlyOnce
• containsOnlyOnceForProxy
• containsOnlyNulls
• containsExactly
• containsExactlyForProxy
• containsExactlyInAnyOrder
• containsExactlyInAnyOrderForProxy
• containsExactlyInAnyOrderElementsOf
• isSubsetOf
• isSubsetOfForProxy
• containsSequence
• containsSequenceForProxy
• doesNotContainSequence
• doesNotContainSequenceForProxy
• containsSubsequence
• containsSubsequenceForProxy
• doesNotContainSubsequence
• doesNotContainSubsequenceForProxy
• doesNotContain
• doesNotContainForProxy
• doesNotContainAnyElementsOf
• doesNotHaveDuplicates
• startsWith
• startsWithForProxy
• endsWith
• endsWithForProxy
• containsNull
• doesNotContainNull
• areNot
• have
• doNotHave
• areAtLeastOne
• areAtLeast
• areAtMost
• areExactly
• haveAtLeastOne
• haveAtLeast
• haveAtMost
• haveExactly
• hasAtLeastOneElementOfType
• hasOnlyElementsOfType
• doesNotHaveAnyElementsOfTypes
• hasOnlyElementsOfTypes
• hasExactlyElementsOfTypes
• containsAll
• usingElementComparator
• usingExtendedByTypesElementComparator
• usingDefaultElementComparator
• containsAnyOf
• containsAnyOfForProxy
• containsAnyElementsOf
• extracting
• specification
• toString
• sayTheWords
• extractingResultOf
• internalExtracting
• newListAssertInstanceForMethodsChangingElementType
• flatExtracting
• flatMap
• doFlatExtracting
• flatExtractingForProxy
• extractingForProxy
• containsExactlyElementsOf
• containsOnlyElementsOf
• containsOnlyOnceElementsOf
• hasSameElementsAs
• compare
• usingComparatorForElementFieldsWithNames
• usingComparatorForElementFieldsWithType
• usingComparatorForType
• usingFieldByFieldElementComparator
• usingRecursiveFieldByFieldElementComparator
• usingRecursiveComparison
• usingRecursiveAssertion
• usingElementComparatorOnFields
• usingRecursiveFieldByFieldElementComparatorOnFields
• usingComparisonStrategy
• usingElementComparatorIgnoringFields
• usingRecursiveFieldByFieldElementComparatorIgnoringFields
• inHexadecimal
• inBinary
• filteredOn
• filteredOnNull
• matches
• filteredOnAssertions
• internalFilteredOnAssertions
• first
• internalFirst
• last
• internalLast
• lastElement
• element
• elements
• newAbstractIterableAssertForProxy
• assertIndicesIsNotNull
• assertIndicesIsNotEmpty
• checkIndexValidity
• internalElement
• singleElement
• internalSingleElement
• toAssert
• navigationDescription
• removeAssert
• allMatch
• allSatisfy
• internalAllSatisfy
• anyMatch
• zipSatisfy
• anySatisfy
• internalAnySatisfy
• noneSatisfy
• internalNoneSatisfy
• satisfiesExactly
• satisfiesExactlyForProxy
• satisfiesExactlyInAnyOrder
• satisfiesExactlyInAnyOrderForProxy
• satisfiesOnlyOnce
• satisfiesOnlyOnceForProxy
• describedAs
• doesNotHave
• doesNotHaveSameClassAs
• hasSameClassAs
• hasToString
• isEqualTo
• isExactlyInstanceOf
• isIn
• isInstanceOf
• isInstanceOfAny
• isNot
• isNotEqualTo
• isNotExactlyInstanceOf
• isNotIn
• isNotInstanceOf
• isNotInstanceOfAny
• isNotOfAnyClassIn
• isNotNull
• isNotSameAs
• isOfAnyClassIn
• isSameAs
• noneMatch
• overridingErrorMessage
• usingDefaultComparator
• usingComparator
• withFailMessage
• withThreadDumpOnError
• size
• getComparatorsByType
• getComparatorsForElementPropertyOrFieldTypes
• newAbstractIterableAssert
• internalFilteredOn