How to use _dont_implement_Matcher___instead_extend_BaseMatcher_ method of org.hamcrest.Interface Matcher class

Best junit code snippet using org.hamcrest.Interface Matcher._dont_implement_Matcher___instead_extend_BaseMatcher_

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...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}...

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...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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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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