How to use appendDescriptionOf method of org.hamcrest.Interface Description class

Best junit code snippet using org.hamcrest.Interface Description.appendDescriptionOf

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...160 }161 @Override162 public ClassMatcher implementing(Matcher<Type> interfaceMatcher) {163/​/​ this.matchers.addMatcher(164/​/​ description -> description.appendText("should implement ").appendDescriptionOf(interfaceMatcher),165/​/​ item -> Arrays.asList(item.getInterfaces()).stream().anyMatch(aClass -> interfaceMatcher.matches(aClass)),166/​/​ (item, description) -> description.appendText("")167/​/​ );168 this.matchers.addMatcher(169 description -> description.appendText("should implement ").appendDescriptionOf(interfaceMatcher),170 item -> {171 for (Class anInterface : item.getInterfaces()) {172 if(interfaceMatcher.matches(anInterface)) {173 return true;174 }175 }176 return false;177 },178 (item, description) -> description.appendDescriptionOf(interfaceMatcher)179 );180 return this;181 }182 @Override183 public ClassMatcher extending(Class aClass) {184 this.matchers.addMatcher(185 "extends " + aClass.getName(),186 item -> aClass.equals(item.getSuperclass()),187 (item, description) -> description.appendText("was false")188 );189 return this;190 }191}...

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...30 }31 @Override32 public void describePredicateOnFinder(Finder<E, CollectionOf<E>, ?> finder, Description description) {33 describeNumberExpectedTo(description); 34 description.appendDescriptionOf(finder);35 }36 @Override37 public boolean isSatisfiedBy(CollectionOf<E> foundElements) {38 return cardinalityConstraint.matches(foundElements.size());39 }40 41 @Override42 public void diagnoseNotSatisfyingTo(Description dissatisfactionDescription,43 CollectionOf<E> foundElements, Description notFoundDescription) {44 if(foundElements.size()>0)45 describeActualNumberFound(foundElements, dissatisfactionDescription);46 else{47 dissatisfactionDescription48 .appendText("Not found - ")49 .appendText(notFoundDescription.toString());50 }51 }52 53 protected void describeActualNumberFound(Collection<E> foundElements,54 Description failureDescription) {55 failureDescription.appendText("found ")56 .appendValue(foundElements.size())57 .appendText(" such elements")58 .appendDescriptionOf(describable(foundElements));59 }60 61 protected void describeNumberExpectedTo(Description description) {62 if(cardinalityConstraint instanceof CustomNumberMatcher)63 description64 .appendDescriptionOf(cardinalityConstraint)65 .appendText(" ");66 67 else68 description69 .appendText("there to be ")70 .appendDescriptionOf(cardinalityConstraint)71 .appendText(" of ");72 }73 74 public static interface CustomNumberMatcher{}75 76 @Factory77 public static <E> Predicate<E, CollectionOf<E>> aNumberOfElements(Matcher<Integer> cardinalityConstraint){78 return new SomeNumberOfItems<E>(cardinalityConstraint);79 }80}...

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...46 @Override47 public void describeTo(Description description) {48 description49 .appendText(String.format("as interface of %s: ", _node))50 .appendDescriptionOf(_subMatcher);51 }52 @Override53 protected boolean matchesSafely(String item, Description mismatchDescription) {54 NodeInterfacePair pair = NodeInterfacePair.of(_node, item);55 if (!_subMatcher.matches(pair)) {56 mismatchDescription57 .appendText(String.format("%s as interface of %s did not satisfy: ", item, _node))58 .appendDescriptionOf(_subMatcher);59 return false;60 }61 return true;62 }63 }64 private TopologyMatchersImpl() {}65}...

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1package org.hamcrest;2public interface Description {3 public static final Description NONE = new NullDescription();4 Description appendDescriptionOf(SelfDescribing selfDescribing);5 Description appendList(String str, String str2, String str3, Iterable<? extends SelfDescribing> iterable);6 Description appendText(String str);7 Description appendValue(Object obj);8 <T> Description appendValueList(String str, String str2, String str3, Iterable<T> iterable);9 <T> Description appendValueList(String str, String str2, String str3, T... tArr);10 public static final class NullDescription implements Description {11 @Override /​/​ org.hamcrest.Description12 public Description appendDescriptionOf(SelfDescribing value) {13 return this;14 }15 @Override /​/​ org.hamcrest.Description16 public Description appendList(String start, String separator, String end, Iterable<? extends SelfDescribing> iterable) {17 return this;18 }19 @Override /​/​ org.hamcrest.Description20 public Description appendText(String text) {21 return this;22 }23 @Override /​/​ org.hamcrest.Description24 public Description appendValue(Object value) {25 return this;26 }...

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appendDescriptionOf

Using AI Code Generation

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1package com.example;2import org.hamcrest.Description;3import org.hamcrest.Factory;4import org.hamcrest.Matcher;5import org.hamcrest.TypeSafeMatcher;6public class IsInInclusiveRange<T extends Comparable<T>> extends TypeSafeMatcher<T> {7 private final T min;8 private final T max;9 public IsInInclusiveRange(T min, T max) {10 this.min = min;11 this.max = max;12 }13 public boolean matchesSafely(T item) {14 return min.compareTo(item) <= 0 && item.compareTo(max) <= 0;15 }16 public void describeTo(Description description) {17 description.appendText("a value between ").appendDescriptionOf(min).appendText(" and ").appendDescriptionOf(max);18 }19 public static <T extends Comparable<T>> Matcher<T> isInInclusiveRange(T min, T max) {20 return new IsInInclusiveRange<T>(min, max);21 }22}23package com.example;24import org.hamcrest.Matcher;25import org.junit.Test;26import java.math.BigDecimal;27import static com.example.IsInInclusiveRange.isInInclusiveRange;28import static org.hamcrest.MatcherAssert.assertThat;29import static org.hamcrest.Matchers.is;30public class IsInInclusiveRangeTest {31 public void testIsInInclusiveRange() {32 Matcher<BigDecimal> matcher = isInInclusiveRange(BigDecimal.ONE, BigDecimal.TEN);33 assertThat(BigDecimal.ONE, is(matcher));34 assertThat(BigDecimal.TEN, is(matcher));35 assertThat(BigDecimal.valueOf(5), is(matcher));36 }37}

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appendDescriptionOf

Using AI Code Generation

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1import org.hamcrest.Description2import org.hamcrest.Matcher3import org.hamcrest.TypeSafeMatcher4class CustomDescriptionMatcher extends TypeSafeMatcher<String> {5 CustomDescriptionMatcher(Matcher<String> matcher, String description) {6 }7 boolean matchesSafely(String item) {8 matcher.matches(item)9 }10 void describeTo(Description description) {11 matcher.describeTo(description)12 }13 void describeMismatchSafely(String item, Description mismatchDescription) {14 matcher.describeMismatch(item, mismatchDescription)15 }16 void appendDescriptionOf(Description description) {17 description.appendText(this.description)18 }19}20def customDescriptionMatcher(Matcher<String> matcher, String description) {21 new CustomDescriptionMatcher(matcher, description)22}23assertThat("Hello World", customDescriptionMatcher(startsWith("Hello"), "Starts with Hello"))24 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)25 at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)26 at Script1.run(Script1.groovy:52)

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appendDescriptionOf

Using AI Code Generation

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1 public void describeTo(Description description) {2 description.appendText("a string containing ")3 .appendDescriptionOf(substringMatcher);4 }5}6public void testMatchesSafely() {7 String testString = "test string";8 assertThat(testString, containsString("test"));9}10public void testDoesNotMatchSafely() {11 String testString = "test string";12 assertThat(testString, not(containsString("test ")));13}14public void testDescribeMismatchSafely() {15 String testString = "test string";16 assertThrows(AssertionError.class,17 () -> assertThat(testString, containsString("test ")));18}19public void testDescribeTo() {20 String testString = "test string";21 assertThrows(AssertionError.class,22 () -> assertThat(testString, containsString("test ")));23}24public void testDescribeMismatchSafely() {25 String testString = "test string";26 assertThrows(AssertionError.class,27 () -> assertThat(testString, containsString("test ")));28}29public void testDescribeTo() {30 String testString = "test string";31 assertThrows(AssertionError.class,32 () -> assertThat(testString, containsString("test ")));33}34public void testDescribeMismatchSafely() {35 String testString = "test string";36 assertThrows(AssertionError.class,37 () -> assertThat(testString, containsString("test ")));38}39public void testDescribeTo() {40 String testString = "test string";41 assertThrows(AssertionError.class,42 () -> assertThat(testString, containsString("test ")));43}

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appendDescriptionOf

Using AI Code Generation

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1import org.hamcrest.Description;2import org.hamcrest.Matcher;3import org.hamcrest.TypeSafeDiagnosingMatcher;4public class TypeSafeDiagnosingMatcherDemo extends TypeSafeDiagnosingMatcher<String>{5 public void describeTo(Description description) {6 description.appendText("a string with length of ");7 description.appendValue(10);8 }9 protected boolean matchesSafely(String item, Description mismatchDescription) {10 if(item.length() == 10){11 return true;12 }13 mismatchDescription.appendText("was a string with length of ");14 mismatchDescription.appendValue(item.length());15 return false;16 }17 public static Matcher<String> hasLengthOf10(){18 return new TypeSafeDiagnosingMatcherDemo();19 }20}21import static org.hamcrest.MatcherAssert.assertThat;22import static org.hamcrest.Matchers.equalTo;23import static org.hamcrest.Matchers.is;24import org.hamcrest.Matcher;25import org.junit.Test;26public class TypeSafeDiagnosingMatcherDemoTest {27 public void testHasLengthOf10(){28 Matcher<String> matcher = TypeSafeDiagnosingMatcherDemo.hasLengthOf10();29 assertThat("1234567890", is(matcher));30 assertThat("123456789", is(equalTo(matcher)));31 }32}

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appendDescriptionOf

Using AI Code Generation

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1public class AppendingDescriptionOfMatcher<T> extends TypeSafeMatcher<T> {2 private final Matcher<T> matcher;3 private final T object;4 public AppendingDescriptionOfMatcher(Matcher<T> matcher, T object) {5 this.matcher = matcher;6 this.object = object;7 }8 public void describeTo(Description description) {9 matcher.describeTo(description);10 description.appendText(" ").appendDescriptionOf(object);11 }12 protected boolean matchesSafely(T item) {13 return matcher.matches(item);14 }15 protected void describeMismatchSafely(T item, Description mismatchDescription) {16 matcher.describeMismatch(item, mismatchDescription);17 }18 public static <T> Matcher<T> appendDescriptionOf(Matcher<T> matcher, T object) {19 return new AppendingDescriptionOfMatcher<>(matcher, object);20 }21}22public class AppendingDescriptionOfMatcher<T> extends TypeSafeMatcher<T> {23 private final Matcher<T> matcher;24 private final T object;25 public AppendingDescriptionOfMatcher(Matcher<T> matcher, T object) {26 this.matcher = matcher;27 this.object = object;28 }29 public void describeTo(Description description) {30 matcher.describeTo(description);31 description.appendText(" ").appendDescriptionOf(object);32 }33 protected boolean matchesSafely(T item) {34 return matcher.matches(item);35 }36 protected void describeMismatchSafely(T item, Description mismatchDescription) {37 matcher.describeMismatch(item, mismatchDescription);38 }39 public static <T> Matcher<T> appendDescriptionOf(Matcher<T> matcher, T object) {40 return new AppendingDescriptionOfMatcher<>(matcher, object);41 }42}

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appendDescriptionOf

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1class StartsWith extends TypeSafeDiagnosingMatcher<String> {2 StartsWith(String prefix) {3 }4 protected boolean matchesSafely(String item, Description mismatchDescription) {5 boolean matches = item.startsWith(prefix)6 if (!matches) {7 mismatchDescription.appendText("was \"").appendText(item).appendText("\"")8 }9 }10 public void describeTo(Description description) {11 description.appendText("string starting with \"").appendText(prefix).appendText("\"")12 }13}14static Matcher<String> startsWith(String prefix) {15 return new StartsWith(prefix)16}17def "a string starting with a given prefix"() {18 "abc" == startsWith("a")19 "abc" != startsWith("b")20}21def "a string starting with a given prefix"() {22 "abc" == startsWith("a")23 "abc" != startsWith("b")24}25def "a string starting with a given prefix"() {26 "abc" == startsWith("a")27 "abc" != startsWith("b")28}29def "a string starting with a given prefix"() {30 "abc" == startsWith("a")31 "abc" != startsWith("b")32}33def "a string starting with a given prefix"() {34 "abc" == startsWith("a")35 "abc" != startsWith("b")36}37def "a string starting with a given prefix"() {38 "abc" == startsWith("a")39 "abc" != startsWith("b")40}

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You should not need to test private methods.

  • A private method is specifically part of the implementation. You should not test the implemenation, but the functionality. If you test the functionality a class exposes, you can change the implementation while depending on the unit test.
  • If you feel the need to test a private method, this is a good sign that you should move the private method to another class and make the method public. By doing this, you get smaller classes and you can test the methods easily. If you do not want to expose this new class, you can make it package-private (the default access modifier).
https://stackoverflow.com/questions/3299405/how-should-i-test-private-methods-in-java

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