How to use describeMismatchSafely method of org.hamcrest.TypeSafeMatcher class

Best junit code snippet using org.hamcrest.TypeSafeMatcher.describeMismatchSafely

Source:ElasticsearchMatchers.java Github

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...34 protected boolean matchesSafely(SearchHit searchHit) {35 return searchHit.getId().equals(id);36 }37 @Override38 public void describeMismatchSafely(final SearchHit searchHit, final Description mismatchDescription) {39 mismatchDescription.appendText(" was ").appendValue(searchHit.getId());40 }41 @Override42 public void describeTo(final Description description) {43 description.appendText("searchHit id should be ").appendValue(id);44 }45 }46 public static class SearchHitHasTypeMatcher extends TypeSafeMatcher<SearchHit> {47 private String type;48 public SearchHitHasTypeMatcher(String type) {49 this.type = type;50 }51 @Override52 public boolean matchesSafely(final SearchHit searchHit) {53 return searchHit.getType().equals(type);54 }55 @Override56 public void describeMismatchSafely(final SearchHit searchHit, final Description mismatchDescription) {57 mismatchDescription.appendText(" was ").appendValue(searchHit.getType());58 }59 @Override60 public void describeTo(final Description description) {61 description.appendText("searchHit type should be ").appendValue(type);62 }63 }64 public static class SearchHitHasIndexMatcher extends TypeSafeMatcher<SearchHit> {65 private String index;66 public SearchHitHasIndexMatcher(String index) {67 this.index = index;68 }69 @Override70 public boolean matchesSafely(final SearchHit searchHit) {71 return searchHit.getIndex().equals(index);72 }73 @Override74 public void describeMismatchSafely(final SearchHit searchHit, final Description mismatchDescription) {75 mismatchDescription.appendText(" was ").appendValue(searchHit.getIndex());76 }77 @Override78 public void describeTo(final Description description) {79 description.appendText("searchHit index should be ").appendValue(index);80 }81 }82 public static class SearchHitHasScoreMatcher extends TypeSafeMatcher<SearchHit> {83 private float score;84 public SearchHitHasScoreMatcher(float score) {85 this.score = score;86 }87 @Override88 protected boolean matchesSafely(SearchHit searchHit) {89 return searchHit.getScore() == score;90 }91 @Override92 public void describeMismatchSafely(final SearchHit searchHit, final Description mismatchDescription) {93 mismatchDescription.appendText(" was ").appendValue(searchHit.getScore());94 }95 @Override96 public void describeTo(final Description description) {97 description.appendText("searchHit score should be ").appendValue(score);98 }99 }100 public static class HasPropertyLambdaMatcher<T, V> extends FeatureMatcher<T, V> {101 private final Function<? super T, ? extends V> property;102 private HasPropertyLambdaMatcher(Matcher<? super V> subMatcher, Function<? super T, ? extends V> property) {103 super(subMatcher, "object with", "lambda");104 this.property = property;105 }106 @Override...

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Source:IndexMatchers.java Github

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...35 description.appendText("indexName should be ");36 notEmptyString.describeTo(description);37 }38 @Override39 public void describeMismatchSafely(Index index, Description description) {40 notEmptyString.describeMismatch(index.getIndexName(), description);41 }42 };43 }44 public static Matcher<Index> hasName(final String indexName) {45 return new TypeSafeMatcher<Index>() {46 @Override47 public boolean matchesSafely(Index index) {48 return Objects.equals(indexName, index.getIndexName());49 }50 @Override51 public void describeTo(Description description) {52 description.appendText("indexName should be ").appendValue(indexName);53 }54 @Override55 public void describeMismatchSafely(Index index, Description description) {56 description.appendText("was ").appendValue(index.getIndexName());57 }58 };59 }60 public static Matcher<Index> hasTable(final String tableName) {61 return new TypeSafeMatcher<Index>() {62 @Override63 public boolean matchesSafely(Index index) {64 return Objects.equals(tableName, index.getTableName());65 }66 @Override67 public void describeTo(Description description) {68 description.appendText("tableName should be ").appendValue(tableName);69 }70 @Override71 public void describeMismatchSafely(Index index, Description description) {72 description.appendText("was ").appendValue(index.getTableName());73 }74 };75 }76 public static Matcher<Index> hasFieldsInOrder(final List<String> fieldNames) {77 final Matcher<Iterable<? extends String>> contains = contains(fieldNames.toArray(new String[fieldNames.size()]));78 return new TypeSafeMatcher<Index>() {79 @Override80 public boolean matchesSafely(Index index) {81 return contains.matches(index.getFieldNames());82 }83 @Override84 public void describeTo(Description description) {85 description.appendText("fieldNames should be an ");86 contains.describeTo(description);87 }88 @Override89 public void describeMismatchSafely(Index index, Description description) {90 contains.describeMismatch(index.getFieldNames(), description);91 }92 };93 }94}...

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Source:StacktracePrintingMatcher.java Github

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...11 /​* JADX DEBUG: Failed to find minimal casts for resolve overloaded methods, cast all args instead12 method: MutableMD:(java.lang.Throwable, org.hamcrest.Description):void13 arg types: [T, org.hamcrest.Description]14 candidates:15 org.junit.internal.matchers.StacktracePrintingMatcher.describeMismatchSafely(java.lang.Object, org.hamcrest.Description):void16 MutableMD:(java.lang.Object, org.hamcrest.Description):void17 MutableMD:(java.lang.Throwable, org.hamcrest.Description):void */​18 /​* access modifiers changed from: protected */​19 @Override /​/​ org.hamcrest.TypeSafeMatcher20 public /​* bridge */​ /​* synthetic */​ void describeMismatchSafely(Object obj, Description description) {21 describeMismatchSafely((Throwable) ((Throwable) obj), description);22 }23 /​* access modifiers changed from: protected */​24 @Override /​/​ org.hamcrest.TypeSafeMatcher25 public /​* bridge */​ /​* synthetic */​ boolean matchesSafely(Object obj) {26 return matchesSafely((Throwable) ((Throwable) obj));27 }28 public StacktracePrintingMatcher(Matcher<T> throwableMatcher2) {29 this.throwableMatcher = throwableMatcher2;30 }31 @Override /​/​ org.hamcrest.SelfDescribing32 public void describeTo(Description description) {33 this.throwableMatcher.describeTo(description);34 }35 /​* access modifiers changed from: protected */​36 public boolean matchesSafely(T item) {37 return this.throwableMatcher.matches(item);38 }39 /​* access modifiers changed from: protected */​40 public void describeMismatchSafely(T item, Description description) {41 this.throwableMatcher.describeMismatch(item, description);42 description.appendText("\nStacktrace was: ");43 description.appendText(readStacktrace(item));44 }45 private String readStacktrace(Throwable throwable) {46 StringWriter stringWriter = new StringWriter();47 throwable.printStackTrace(new PrintWriter(stringWriter));48 return stringWriter.toString();49 }50 @Factory51 public static <T extends Throwable> Matcher<T> isThrowable(Matcher<T> throwableMatcher2) {52 return new StacktracePrintingMatcher(throwableMatcher2);53 }54 @Factory...

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Source:Matchers.java Github

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...5class Matchers {6 static Matcher<? super BoardPosition> position(String column, String row) {7 return new TypeSafeMatcher<>() {8 @Override9 protected void describeMismatchSafely(BoardPosition item, Description mismatchDescription) {10 mismatchDescription.appendText(" was ").appendValue(item);11 }12 @Override13 protected boolean matchesSafely(BoardPosition position) {14 return position.isValid() && position.row().equals(row) && position.column().equals(column);15 }16 @Override17 public void describeTo(Description description) {18 description.appendText(String.format("%s%d", column, row));19 }20 };21 }22 static Matcher<? super BoardPosition> invalidPosition() {23 return new TypeSafeMatcher<>() {24 @Override25 protected void describeMismatchSafely(BoardPosition item, Description mismatchDescription) {26 mismatchDescription.appendText(" was ").appendValue(item);27 }28 @Override29 protected boolean matchesSafely(BoardPosition position) {30 return !position.isValid();31 }32 @Override33 public void describeTo(Description description) {34 description.appendText("position should be invalid position");35 }36 };37 }38 @SafeVarargs39 static Matcher<? super Path> path(Matcher<? super BoardPosition>... positions) {40 var baseMatcher = org.hamcrest.Matchers.contains(positions);41 return new TypeSafeMatcher<>() {42 @Override43 protected boolean matchesSafely(Path boardPositions) {44 return baseMatcher.matches(boardPositions);45 }46 @Override47 public void describeTo(Description description) {48 baseMatcher.describeTo(description);49 }50 @Override51 protected void describeMismatchSafely(Path item, Description mismatchDescription) {52 baseMatcher.describeMismatch(item, mismatchDescription);53 }54 };55 }56}...

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Source:ThrowableCauseMatcher.java Github

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...9 /​* JADX DEBUG: Failed to find minimal casts for resolve overloaded methods, cast all args instead10 method: MutableMD:(java.lang.Throwable, org.hamcrest.Description):void11 arg types: [T, org.hamcrest.Description]12 candidates:13 org.junit.internal.matchers.ThrowableCauseMatcher.describeMismatchSafely(java.lang.Object, org.hamcrest.Description):void14 MutableMD:(java.lang.Object, org.hamcrest.Description):void15 MutableMD:(java.lang.Throwable, org.hamcrest.Description):void */​16 /​* access modifiers changed from: protected */​17 @Override /​/​ org.hamcrest.TypeSafeMatcher18 public /​* bridge */​ /​* synthetic */​ void describeMismatchSafely(Object obj, Description description) {19 describeMismatchSafely((Throwable) ((Throwable) obj), description);20 }21 /​* access modifiers changed from: protected */​22 @Override /​/​ org.hamcrest.TypeSafeMatcher23 public /​* bridge */​ /​* synthetic */​ boolean matchesSafely(Object obj) {24 return matchesSafely((Throwable) ((Throwable) obj));25 }26 public ThrowableCauseMatcher(Matcher<? extends Throwable> causeMatcher2) {27 this.causeMatcher = causeMatcher2;28 }29 @Override /​/​ org.hamcrest.SelfDescribing30 public void describeTo(Description description) {31 description.appendText("exception with cause ");32 description.appendDescriptionOf(this.causeMatcher);33 }34 /​* access modifiers changed from: protected */​35 public boolean matchesSafely(T item) {36 return this.causeMatcher.matches(item.getCause());37 }38 /​* access modifiers changed from: protected */​39 public void describeMismatchSafely(T item, Description description) {40 description.appendText("cause ");41 this.causeMatcher.describeMismatch(item.getCause(), description);42 }43 @Factory44 public static <T extends Throwable> Matcher<T> hasCause(Matcher<? extends Throwable> matcher) {45 return new ThrowableCauseMatcher(matcher);46 }47}...

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...9 /​* JADX DEBUG: Failed to find minimal casts for resolve overloaded methods, cast all args instead10 method: MutableMD:(java.lang.Throwable, org.hamcrest.Description):void11 arg types: [T, org.hamcrest.Description]12 candidates:13 org.junit.internal.matchers.ThrowableMessageMatcher.describeMismatchSafely(java.lang.Object, org.hamcrest.Description):void14 MutableMD:(java.lang.Object, org.hamcrest.Description):void15 MutableMD:(java.lang.Throwable, org.hamcrest.Description):void */​16 /​* access modifiers changed from: protected */​17 @Override /​/​ org.hamcrest.TypeSafeMatcher18 public /​* bridge */​ /​* synthetic */​ void describeMismatchSafely(Object obj, Description description) {19 describeMismatchSafely((Throwable) ((Throwable) obj), description);20 }21 /​* access modifiers changed from: protected */​22 @Override /​/​ org.hamcrest.TypeSafeMatcher23 public /​* bridge */​ /​* synthetic */​ boolean matchesSafely(Object obj) {24 return matchesSafely((Throwable) ((Throwable) obj));25 }26 public ThrowableMessageMatcher(Matcher<String> matcher2) {27 this.matcher = matcher2;28 }29 @Override /​/​ org.hamcrest.SelfDescribing30 public void describeTo(Description description) {31 description.appendText("exception with message ");32 description.appendDescriptionOf(this.matcher);33 }34 /​* access modifiers changed from: protected */​35 public boolean matchesSafely(T item) {36 return this.matcher.matches(item.getMessage());37 }38 /​* access modifiers changed from: protected */​39 public void describeMismatchSafely(T item, Description description) {40 description.appendText("message ");41 this.matcher.describeMismatch(item.getMessage(), description);42 }43 @Factory44 public static <T extends Throwable> Matcher<T> hasMessage(Matcher<String> matcher2) {45 return new ThrowableMessageMatcher(matcher2);46 }47}...

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...14 protected TypeSafeMatcher(ReflectiveTypeFinder typeFinder) {15 this.expectedType = typeFinder.findExpectedType(getClass());16 }17 /​* access modifiers changed from: protected */​18 public void describeMismatchSafely(T item, Description mismatchDescription) {19 super.describeMismatch(item, mismatchDescription);20 }21 @Override /​/​ org.hamcrest.Matcher22 public final boolean matches(Object item) {23 return item != null && this.expectedType.isInstance(item) && matchesSafely(item);24 }25 @Override /​/​ org.hamcrest.BaseMatcher, org.hamcrest.Matcher26 public final void describeMismatch(Object item, Description description) {27 if (item == null) {28 super.describeMismatch(null, description);29 } else if (!this.expectedType.isInstance(item)) {30 description.appendText("was a ").appendText(item.getClass().getName()).appendText(" (").appendValue(item).appendText(")");31 } else {32 describeMismatchSafely(item, description);33 }34 }35}...

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Source:438.java Github

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describeMismatchSafely

Using AI Code Generation

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1public class TypeSafeMatcherTest {2 public void testTypeSafeMatcher() {3 Matcher<String> matcher = new TypeSafeMatcher<String>() {4 public void describeTo(Description description) {5 description.appendText("a string with length 5");6 }7 protected boolean matchesSafely(String item) {8 return item.length() == 5;9 }10 };11 assertThat("abcde", matcher);12 }13}14org.hamcrest.MatcherAssert.assertThat(Matcher, Matcher)15public static <T> void assertThat(T actual, Matcher<T> matcher)

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describeMismatchSafely

Using AI Code Generation

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1public class TypeSafeMatcherTest {2 public void testTypeSafeMatcher() {3 Matcher<String> matcher = new TypeSafeMatcher<String>() {4 public void describeTo(Description description) {5 description.appendText("contains string");6 }7 protected boolean matchesSafely(String item) {8 return item.contains("string");9 }10 protected void describeMismatchSafely(String item, Description mismatchDescription) {11 mismatchDescription.appendText("was ").appendValue(item);12 }13 };14 assertThat("some string", matcher);15 assertThat("some string", not(matcher));16 }17}18org.hamcrest.TypeSafeMatcherTest > testTypeSafeMatcher() PASSED

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describeMismatchSafely

Using AI Code Generation

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1import static org.hamcrest.MatcherAssert.assertThat;2import static org.hamcrest.Matchers.is;3import org.hamcrest.Description;4import org.hamcrest.TypeSafeMatcher;5import org.junit.Test;6public class TypeSafeMatcherTest {7 public void testTypeSafeMatcher() {8 assertThat("Hello", is(new TypeSafeMatcher<String>() {9 public void describeTo(Description description) {10 description.appendText("is \"Hello\"");11 }12 protected boolean matchesSafely(String item) {13 return "Hello".equals(item);14 }15 protected void describeMismatchSafely(String item, Description mismatchDescription) {16 mismatchDescription.appendText("was \"").appendText(item).appendText("\"");17 }18 }));19 }20}21org.hamcrest.core.Is.is("Hello")

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describeMismatchSafely

Using AI Code Generation

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1package com.zetcode;2import org.hamcrest.Description;3import org.hamcrest.Matcher;4import org.hamcrest.StringDescription;5import org.hamcrest.TypeSafeMatcher;6public class DescribeMatcherEx {7 public static void main(String[] args) {8 Matcher<String> m = new TypeSafeMatcher<String>() {9 public void describeTo(Description description) {10 description.appendText("a string of length 5");11 }12 protected boolean matchesSafely(String item) {13 return item.length() == 5;14 }15 protected void describeMismatchSafely(String item,16 Description mismatchDescription) {17 mismatchDescription.appendText("was ").appendValue(item);18 }19 };20 StringDescription description = new StringDescription();21 m.describeMismatch("hello", description);22 System.out.println(description.toString());23 }24}

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describeMismatchSafely

Using AI Code Generation

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1public class CustomMismatchDescription extends TypeSafeMatcher<String> {2 private String expected;3 public CustomMismatchDescription(String expected) {4 this.expected = expected;5 }6 protected boolean matchesSafely(String item) {7 return expected.equals(item);8 }9 protected void describeMismatchSafely(String item, Description mismatchDescription) {10 mismatchDescription.appendText("was ").appendValue(item);11 }12 public void describeTo(Description description) {13 description.appendText("matches ").appendValue(expected);14 }15}16public class CustomMismatchDescriptionTest {17 public void testCustomMismatchDescription() {18 assertThat("foo", new CustomMismatchDescription("bar"));19 }20}21public class CustomMismatchDescription extends BaseMatcher<String> {22 private String expected;23 public CustomMismatchDescription(String expected) {24 this.expected = expected;25 }26 public boolean matches(Object item) {27 return expected.equals(item);28 }29 public void describeMismatch(Object item, Description mismatchDescription) {30 mismatchDescription.appendText("was ").appendValue(item);31 }32 public void describeTo(Description description) {33 description.appendText("matches ").appendValue(expected);34 }35}36public class CustomMismatchDescriptionTest {37 public void testCustomMismatchDescription() {38 assertThat("foo", new CustomMismatchDescription("bar"));39 }40}41public class CustomMismatchDescription implements Matcher<String> {42 private String expected;43 public CustomMismatchDescription(String expected) {44 this.expected = expected;45 }46 public boolean matches(Object

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StackOverFlow community discussions

Questions
Discussion

@RunWith(MockitoJUnitRunner.class) vs MockitoAnnotations.initMocks(this)

Why @Rule annotated fields in JUnit has to be public?

NoClassDefFoundError when using Powermock

Exception in thread &quot;main&quot; java.lang.NoClassDefFoundError: junit/textui/ResultPrinter After updating to Yosemite

Compare two XML strings ignoring element order

Missing &quot;Run as JUnit Test&quot;

How do Java mocking frameworks work?

Junit before class ( non static )

Does JUnit 3 have something analogous to @BeforeClass?

mock instance is null after @Mock annotation

MockitoJUnitRunner gives you automatic validation of framework usage, as well as an automatic initMocks().

The automatic validation of framework usage is actually worth having. It gives you better reporting if you make one of these mistakes.

  • You call the static when method, but don't complete the stubbing with a matching thenReturn, thenThrow or then. (Error 1 in the code below)

  • You call verify on a mock, but forget to provide the method call that you are trying to verify. (Error 2 in the code below)

  • You call the when method after doReturn, doThrow or doAnswer and pass a mock, but forget to provide the method that you are trying to stub. (Error 3 in the code below)

If you don't have validation of framework usage, these mistakes are not reported until the following call to a Mockito method. This might be

  • in the same test method (like error 1 below),
  • in the next test method (like error 2 below),
  • in the next test class.

If they occur in the last test that you run (like error 3 below), they won't be reported at all.

Here's how each of those types of errors might look. Assume here that JUnit runs these tests in the order they're listed here.

@Test
public void test1() {

    // ERROR 1
    // This compiles and runs, but it's an invalid use of the framework because 
    // Mockito is still waiting to find out what it should do when myMethod is called.
    // But Mockito can't report it yet, because the call to thenReturn might 
    // be yet to happen.
    when(myMock.method1());

    doSomeTestingStuff();

    // ERROR 1 is reported on the following line, even though it's not the line with
    // the error.
    verify(myMock).method2();

}

@Test
public void test2() {

    doSomeTestingStuff();

    // ERROR 2
    // This compiles and runs, but it's an invalid use of the framework because
    // Mockito doesn't know what method call to verify.  But Mockito can't report 
    // it yet, because the call to the method that's being verified might 
    // be yet to happen.
    verify(myMock);
}

@Test
public void test3() {

    // ERROR 2 is reported on the following line, even though it's not even in 
    // the same test as the error.
    doReturn("Hello").when(myMock).method1();


    // ERROR 3
    // This compiles and runs, but it's an invalid use of the framework because
    // Mockito doesn't know what method call is being stubbed.  But Mockito can't 
    // report it yet, because the call to the method that's being stubbed might 
    // be yet to happen.

    doReturn("World").when(myMock);

    doSomeTestingStuff(); 

    //  ERROR 3 is never reported, because there are no more Mockito calls. 
}

Now when I first wrote this answer more than five years ago, I wrote

So I would recommend the use of the MockitoJUnitRunner wherever possible. However, as Tomasz Nurkiewicz has correctly pointed out, you can't use it if you need another JUnit runner, such as the Spring one.

My recommendation has now changed. The Mockito team have added a new feature since I first wrote this answer. It's a JUnit rule, which performs exactly the same function as the MockitoJUnitRunner. But it's better, because it doesn't preclude the use of other runners.

Include

@Rule 
public MockitoRule rule = MockitoJUnit.rule();

in your test class. This initialises the mocks, and automates the framework validation; just like MockitoJUnitRunner does. But now, you can use SpringJUnit4ClassRunner or any other JUnitRunner as well. From Mockito 2.1.0 onwards, there are additional options that control exactly what kind of problems get reported.

https://stackoverflow.com/questions/10806345/runwithmockitojunitrunner-class-vs-mockitoannotations-initmocksthis

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