How to use describeTo method of org.assertj.core.matcher.AssertionMatcher class

Best Assertj code snippet using org.assertj.core.matcher.AssertionMatcher.describeTo

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...34 @Test35 public void matcher_should_not_fill_description_when_assertion_passes() {36 Description description = Mockito.mock(Description.class);37 Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ZERO)).isTrue();38 isZeroMatcher.describeTo(description);39 Mockito.verifyZeroInteractions(description);40 }41 @Test42 public void matcher_should_fail_when_assertion_fails() {43 Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ONE)).isFalse();44 }45 /​**46 * {@link Failures#removeAssertJRelatedElementsFromStackTrace} must be set to true47 * in order for this test to pass. It is in {@link this#setUp()}.48 */​49 @Test50 public void matcher_should_fill_description_when_assertion_fails() {51 Description description = Mockito.mock(Description.class);52 Assertions.assertThat(isZeroMatcher.matches(AssertionMatcher_matches_Test.ONE)).isFalse();53 isZeroMatcher.describeTo(description);54 Mockito.verify(description).appendText("AssertionError with message: ");55 Mockito.verify(description).appendText(String.format("%nExpecting:%n <1>%nto be equal to:%n <0>%nbut was not."));56 Mockito.verify(description).appendText(String.format("%n%nStacktrace was: "));57 /​/​ @format:off58 Mockito.verify(description).appendText(ArgumentMatchers.argThat(new ArgumentMatcher<String>() {59 @Override60 public boolean matches(String s) {61 return (((s.contains(String.format("%nExpecting:%n <1>%nto be equal to:%n <0>%nbut was not."))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher_matches_Test$1.assertion(AssertionMatcher_matches_Test.java:"))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:"))) && (s.contains("at org.assertj.core.matcher.AssertionMatcher_matches_Test.matcher_should_fill_description_when_assertion_fails(AssertionMatcher_matches_Test.java:"));62 }63 }));64 /​/​ @format:on65 }66}...

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...18/​**19 * Generic Hamcrest {@link Matcher} that reuses AssertJ assertions.20 * <p>21 * Overriding classes should only implement {@link AssertionMatcher#assertion(Object)} method as 22 * {@link Matcher#matches(Object)} and {@link Matcher#describeTo(Description)} are provided. 23 * <p>24 * If the matcher fails, the description will contain the stacktrace of the first failed assertion.25 * <p>26 * Example with Mockito:27 * <pre><code class='java'> verify(customerRepository).save(argThat(new AssertionMatcher&lt;Customer&gt;() {28 * &#64;Override29 * public void assertion(Customer actual) throws AssertionError {30 * assertThat(actual).hasName(&quot;John&quot;)31 * .hasAge(30);32 * }33 * })34 * );</​code></​pre>35 * 36 * @param <T> the type of the object to test37 *38 * @author Tomasz Kalkosiński39 * @since 2.7.0 /​ 3.7.040 */​41public abstract class AssertionMatcher<T> extends BaseMatcher<T> {42 private AssertionError firstError;43 /​**44 * {@inheritDoc}45 */​46 @SuppressWarnings("unchecked")47 @Override48 public boolean matches(Object argument) {49 T actual = (T) argument;50 try {51 assertion(actual);52 return true;53 } catch (AssertionError e) {54 firstError = e;55 return false;56 }57 }58 /​**59 * Perform the assertions implemented in this method when the {@link AssertionMatcher} is used as an Hamcrest {@link Matcher}.60 *61 * If the matcher fails, the description will contain the stacktrace of the first failed assertion.62 * <p>63 * Example with Mockito:64 * <pre><code class='java'> verify(customerRepository).save(argThat(new AssertionMatcher&lt;Customer&gt;() {65 * &#64;Override66 * public void assertion(Customer actual) throws AssertionError {67 * assertThat(actual).hasName(&quot;John&quot;)68 * .hasAge(30);69 * }70 * })71 * );</​code></​pre>72 *73 * @param actual assertion object74 * @throws AssertionError if the assertion object fails assertion75 */​76 public abstract void assertion(T actual) throws AssertionError;77 /​**78 * {@inheritDoc}79 */​80 @Override81 public void describeTo(Description description) {82 if (firstError != null) {83 description.appendText("AssertionError with message: ");84 description.appendText(firstError.getMessage());85 description.appendText(String.format("%n%nStacktrace was: "));86 description.appendText(Throwables.getStackTrace(firstError));87 }88 }89}...

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describeTo

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1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import java.util.ArrayList;4import java.util.Collection;5import java.util.List;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.assertThatExceptionOfType;8import static org.assertj.core.api.Assertions.assertThatThrownBy;9public class AssertJTest {10 public void testAssertJ(){11 List<String> list = new ArrayList<>();12 list.add("one");13 list.add("two");14 list.add("three");15 assertThat(list).hasSize(3)16 .contains("one", "two")17 .doesNotContain("four")18 .allMatch(s -> s.length() > 2)19 .noneMatch(s -> s.length() > 4);20 assertThatExceptionOfType(RuntimeException.class)21 .isThrownBy(() -> { throw new RuntimeException("boom!"); })22 .withMessage("boom!")23 .withNoCause();24 assertThatThrownBy(() -> { throw new RuntimeException("boom!"); })25 .isInstanceOf(RuntimeException.class)26 .hasMessage("boom!")27 .hasNoCause();28 assertThat(list).extracting(String::length).contains(3, 4, 5);29 assertThat(list).extracting("length").contains(3, 4, 5);30 assertThat(list).extracting("length", Integer.class).contains(3, 4, 5);31 assertThat(list).filteredOn(s -> s.length() > 3).contains("three");32 assertThat(list).filteredOn("length", 5).contains("three");33 assertThat(list).filteredOn("length", in(3, 5)).contains("one", "three");34 assertThat(list).flatExtracting(String::chars).contains(1, 2, 3);35 assertThat(list).flatExtracting("chars").contains(1, 2, 3);36 assertThat(list).flatExtracting("chars", Integer.class).contains(1, 2, 3);37 }38 private static AssertionMatcher<Integer> in(final int... values) {39 return new AssertionMatcher<Integer>() {40 public void assertion(Integer actual) {41 assertThat(values).contains(actual);42 }43 };44 }45}

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describeTo

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1import org.assertj.core.matcher.AssertionMatcher;2import org.hamcrest.Description;3import org.hamcrest.Matcher;4import org.junit.Test;5import static org.hamcrest.MatcherAssert.assertThat;6import static org.hamcrest.Matchers.is;7import static org.hamcrest.Matchers.not;8import static org.hamcrest.Matchers.startsWith;9public class AssertionMatcherTest {10 public void testAssertionMatcher() {11 AssertionMatcher<Integer> assertionMatcher = new AssertionMatcher<Integer>() {12 public void assertion(Integer actual) {13 assertThat(actual, startsWith(1));14 }15 };16 assertThat(12, assertionMatcher);17 assertThat(2, not(assertionMatcher));18 }19}20import org.hamcrest.BaseMatcher;21import org.hamcrest.Description;22import org.hamcrest.Matcher;23import org.junit.Test;24import static org.hamcrest.MatcherAssert.assertThat;25import static org.hamcrest.Matchers.is;26import static org.hamcrest.Matchers.not;27import static org.hamcrest.Matchers.startsWith;28public class BaseMatcherTest {29 public void testBaseMatcher() {30 BaseMatcher<Integer> baseMatcher = new BaseMatcher<Integer>() {31 public void describeTo(Description description) {32 description.appendText("starts with 1");33 }34 public boolean matches(Object item) {35 return item.toString().startsWith("1");36 }37 };38 assertThat(12, is(baseMatcher));39 assertThat(2, is(not(baseMatcher)));40 }41}42import org.hamcrest.Description;43import org.hamcrest.TypeSafeMatcher;44import org.junit.Test;45import static org.hamcrest.MatcherAssert.assertThat;46import static org.hamcrest.Matchers.is;47import static org.hamcrest.Matchers.not;48import static org.hamcrest.Matchers.startsWith;49public class TypeSafeMatcherTest {50 public void testTypeSafeMatcher() {51 TypeSafeMatcher<Integer> typeSafeMatcher = new TypeSafeMatcher<Integer>() {52 public void describeTo(Description description) {53 description.appendText("starts with 1");54 }55 protected boolean matchesSafely(Integer item) {56 return item.toString().startsWith("1");57 }58 };59 assertThat(12, is(typeSafeMatcher));60 assertThat(2, is(not(typeSafeMatcher)));61 }62}63import org.hamcrest.SelfDes

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1import org.junit.Test;2import org.junit.runner.RunWith;3import org.mockito.junit.MockitoJUnitRunner;4import org.assertj.core.matcher.AssertionMatcher;5import static org.assertj.core.api.Assertions.assertThat;6import static org.mockito.Mockito.mock;7public class 1 {8 public void test() {9 AssertionMatcher<Object> assertionMatcher = new AssertionMatcher<Object>() {10 public void assertion(Object o) {11 assertThat(o).isEqualTo("test");12 }13 };14 assertThat(assertionMatcher).describedAs("test").matches("test");15 }16}17 at org.junit.Assert.assertEquals(Assert.java:115)18 at org.junit.Assert.assertEquals(Assert.java:144)19 at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:34)20 at org.assertj.core.matcher.AssertionMatcher.matches(AssertionMatcher.java:1)21 at org.assertj.core.api.AbstractAssert.matches(AbstractAssert.java:87)22 at 1.test(1.java:20)23AssertionMatcher.matches() method is called from Abstract

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describeTo

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1package org.junit;2import org.junit.runner.RunWith;3import org.junit.runners.Parameterized;4import org.junit.runners.Parameterized.Parameters;5import org.junit.runners.Parameterized.Parameter;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.assertThatExceptionOfType;8import static org.assertj.core.api.Assertions.catchThrowable;9import static org.assertj.core.api.Assertions.fail;10import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;11import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;12import stati

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describeTo

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1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThat;4public class AssertionMatcherTest {5 public void testAssertionMatcher() {6 assertThat("Java", new AssertionMatcher<String>() {7 public void assertion(String s) throws AssertionError {8 assertThat(s).startsWith("J").endsWith("a");9 }10 });11 }12}

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describeTo

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1import org.assertj.core.matcher.AssertionMatcher;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThat;4public class AssertJTest {5 public void testAssertJ() {6 assertThat("Hello World").matches(new AssertionMatcher<String>() {7 public void assertion(String s) {8 assertThat(s).isEqualToIgnoringCase("Hello World");9 }10 });11 }12}13import org.assertj.core.matcher.AssertionMatcher;14import org.junit.Test;15import static org.assertj.core.api.Assertions.assertThat;16public class AssertJTest {17 public void testAssertJ() {18 assertThat("Hello World").matches(new AssertionMatcher<String>() {19 public void assertion(String s) {20 assertThat(s).isEqualToIgnoringCase("Hello World");21 }22 });23 }24}25import org.assertj.core.matcher.AssertionMatcher;26import org.junit.Test;27import static org.assertj.core.api.Assertions.assertThat;28public class AssertJTest {29 public void testAssertJ() {30 assertThat("Hello World").matches(new AssertionMatcher<String>() {31 public void assertion(String s) {32 assertThat(s).isEqualToIgnoringCase("Hello World");33 }34 });35 }36}

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describeTo

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1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.matcher.AssertionMatcher.*;3import static org.mockito.Mockito.*;4import java.util.*;5import org.junit.Test;6import org.mockito.Mockito;7import org.mockito.Mockito.*;

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describeTo

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1import java.util.*;2import static org.assertj.core.api.Assertions.assertThat;3import static org.assertj.core.matcher.AssertionMatcher.*;4import static org.assertj.core.api.Assertions.*;5import org.assertj.core.matcher.AssertionMatcher;6public class AssertionMatcherExample {7 public static void main(String[] args) {8 List<String> list = new ArrayList<>();9 list.add("hello");10 list.add("world");11 assertThat(list, hasSize(2));12 assertThat(list, contains("hello", "world"));13 assertThat(list, contains(assertion(s -> s.length() > 3, "length > 3")));14 assertThat(list, contains(assertion(s -> s.length() > 10, "length > 10")));15 }16}

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1import org.junit.*;2import org.junit.runner.*;3import org.junit.runners.*;4import static org.assertj.core.api.Assertions.*;5@RunWith(JUnit4.class)6public class Test1 {7 public void test1() {8 AssertionMatcher<String> assertionMatcher = new AssertionMatcher<String>() {9 public void assertion(String s) {10 assertThat(s).isEqualTo("Hello World");11 }12 };13 assertThat("Hello World").matches(assertionMatcher);14 }15}16OK (1 test)

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