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    <p>You can either mock/verify the java.util.Collections.shuffle([]) method or call the real implementation (with PowerMockito.doCallRealMethod()). But you can't do both.</p> <p>If you remove </p> <pre><code>PowerMockito.doCallRealMethod().when(Collections.class); </code></pre> <p>the call will be verified and the test will pass.</p> <p><a href="https://powermock.googlecode.com/svn/docs/powermock-1.4.7/apidocs/org/powermock/api/mockito/PowerMockito.html#doCallRealMethod%28%29" rel="nofollow">https://powermock.googlecode.com/svn/docs/powermock-1.4.7/apidocs/org/powermock/api/mockito/PowerMockito.html#doCallRealMethod%28%29</a></p> <p>This code works for me:</p> <pre><code>package test; import java.util.Collections; import java.util.LinkedList; import java.util.List; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.Mockito; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest(Collections.class) public class MyTest { @Test public void testShuffle() { PowerMockito.mockStatic(Collections.class); /* PowerMockito.doCallRealMethod().when(Collections.class); remove this line */ Collections.shuffle(Mockito.anyListOf(Something.class)); ClassToTest test = new ClassToTest(); test.doSomething(); PowerMockito.verifyStatic(); // Verify shuffle was called exactly once Collections.shuffle(Mockito.anyListOf(Something.class)); } } class ClassToTest { private List&lt;Something&gt; list = new LinkedList&lt;Something&gt;(); // ... public void doSomething() { Collections.shuffle(list); // do more stuff } } class Something { } </code></pre>
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    1. USChristopher Roscoe
    1. USChristopher Roscoe
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    1. COI tried what you suggested, and my test still fails saying that there were zero interactions with the mock. See my edit.
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      1. USPradeep Gollakota
    2. COAh thank you... I missed the part where I have to call Collections.shuffle()... Although I could have sworn I tried that also.
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