Best junit code snippet using org.hamcrest.Interface Matcher._dont_implement_Matcher___instead_extend_BaseMatcher_
...40 private class IntMatcherFromInterface implements Matcher<Integer> {41 public boolean matches(Object o) {42 return true;43 }44 public void _dont_implement_Matcher___instead_extend_BaseMatcher_() {}45 public void describeTo(Description description) {}46 }47 //Static Matcher interface implementation (instead of the BaseMatcher)48 private static class StaticIntMatcherFromInterface implements Matcher<Integer> {49 public boolean matches(Object o) {50 return true;51 }52 public void _dont_implement_Matcher___instead_extend_BaseMatcher_() {}53 public void describeTo(Description description) {}54 }55 //non-generic matcher implementing the interface56 private static class NonGenericMatcherFromInterface implements Matcher {57 public boolean matches(Object o) {58 return true;59 }60 public void _dont_implement_Matcher___instead_extend_BaseMatcher_() { }61 public void describeTo(Description description) {}62 }63 private static interface IMatcher extends Matcher<Integer> {}64 //non-generic matcher implementing the interface65 private static class SubclassGenericMatcherFromInterface implements Serializable, Cloneable, IMatcher {66 public boolean matches(Object o) {67 return true;68 }69 public void _dont_implement_Matcher___instead_extend_BaseMatcher_() { }70 public void describeTo(Description description) {}71 }72 //I refuse to comment on the sanity of this case73 private static class InsaneEdgeCase extends SubclassGenericMatcherFromInterface {}74 @Test75 public void findsGenericType() {76 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcher.class));77 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcher.class));78 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcherFromInterface.class));79 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcherSubclass.class));80 assertEquals(Integer.class, genericTypeOfMatcher(IntMatcherFromInterface.class));81 assertEquals(Integer.class, genericTypeOfMatcher(StaticIntMatcherFromInterface.class));82 assertEquals(Integer.class, genericTypeOfMatcher(SubclassGenericMatcherFromInterface.class));83 assertEquals(Integer.class, genericTypeOfMatcher(InsaneEdgeCase.class));84 assertEquals(Integer.class, genericTypeOfMatcher(new BaseMatcher<Integer>() {85 public void describeTo(Description description) {86 }87 public boolean matches(Object o) {88 return false;89 }90 }.getClass()));91 assertEquals(Integer.class, genericTypeOfMatcher(new Matcher<Integer>() {92 public void describeTo(Description description) {93 }94 public boolean matches(Object o) {95 return false;96 }97 public void _dont_implement_Matcher___instead_extend_BaseMatcher_() {98 }99 }.getClass()));100 assertEquals(Object.class, genericTypeOfMatcher(Object.class));101 assertEquals(Object.class, genericTypeOfMatcher(String.class));102 assertEquals(Object.class, genericTypeOfMatcher(new HashMap<String, String>().getClass()));103 assertEquals(Object.class, genericTypeOfMatcher(new HashMap<String, String>() {104 }.getClass()));105 assertEquals(Object.class, genericTypeOfMatcher(NonGenericMatcher.class));106 assertEquals(Object.class, genericTypeOfMatcher(NonGenericMatcherFromInterface.class));107 }108}...
Source: BaseMatcher.java
...5 * @see Matcher6 */7public abstract class BaseMatcher<T> implements Matcher<T> {8 /**9 * @see Matcher#_dont_implement_Matcher___instead_extend_BaseMatcher_()10 */11 @Override12 @Deprecated13 public final void _dont_implement_Matcher___instead_extend_BaseMatcher_() {14 // See Matcher interface for an explanation of this method.15 }16 @Override17 public void describeMismatch(Object item, Description description) {18 description.appendText("was ").appendValue(item);19 }20 @Override21 public String toString() {22 return StringDescription.toString(this);23 }24}...
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