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import org.hamcrest.Matchers;
import org.junit.Test;
public final class JunitDependencyTest {
/**
* JUnit dependency test.
*
* This class has three dependencies. These can be on the classpath in
* different orders. Of the two orderings below, the first one will cause a
* NoSuchMethodError, while the second one allows the test to pass
* successfully. See the explanation below for more information.
*
* Ordering 1: junit-4.9, hamcrest-core-1.2.1, hamcrest-library-1.2.1.
* Ordering 2: hamcrest-core-1.2.1, junit-4.9, hamcrest-library-1.2.1.
*/
@Test
public void test() {
/*
* Note that we call Matchers#anyOf(Matcher<T>, Matcher<? super T>).
* This method is provided by hamcrest-library-1.2.1. Said module is
* compiled against hamcrest-core-1.2.1. Matchers#anyOf calls
* AnyOf#anyOf(Matcher<T>, Matcher<? super T>). The latter method is
* provided by hamcrest-core-1.2.1, but *not* by hamcrest-core-1.1.
*
* However, hamcrest-core-1.1 *does* contain a class called AnyOf. Now,
* since junit-4.9 incorporates hamcrest-core-1.1 we must make sure that
* hamcrest-core-1.2.1 is placed *before* junit-4.9 on the classpath.
* Failure to do so will cause the wrong AnyOf class to be used. The
* result is a NoSuchMethodError.
*/
Matchers.anyOf(Matchers.nullValue(), Matchers.notNullValue());
}
}
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