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POMocked private method with PowerMock, but underlying method still gets called
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  1. POMocked private method with PowerMock, but underlying method still gets called
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    copied!<p>I am trying to mocking to mock out a private method that is making a JNDI call. When that method gets called from a unit test, it throws an exception^. I would like to mock-out that method for testing purposes. I used the <a href="https://stackoverflow.com/questions/7803944/how-to-mock-private-method-for-testing-using-powermock/7804428#comment9868717_7804428">sample code from another questions answer</a>, and while the test passes, it seems that the underlying method still gets called. I inserted a <code>System.err.println()</code> in the <code>doTheGamble()</code> method, and it gets printed out to my console.</p> <p>Interesting enough, if I comment out the first <code>assertThat</code>, the test passes. ?:(</p> <p>So, how do I mock out a private method so that it does not get called?</p> <pre><code>import static org.hamcrest.core.Is.is; import static org.junit.Assert.assertThat; import static org.mockito.Matchers.anyInt; import static org.mockito.Matchers.anyString; import static org.powermock.api.mockito.PowerMockito.when; import static org.powermock.api.support.membermodification.MemberMatcher.method; import java.util.Random; import org.junit.Test; import org.junit.runner.RunWith; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest(CodeWithPrivateMethod.class) public class PowerMock_Test { static boolean gambleCalled = false; @Test(expected = RuntimeException.class) public void when_gambling_is_true_then_always_explode() throws Exception { CodeWithPrivateMethod spy = PowerMockito.spy(new CodeWithPrivateMethod()); when(spy, method(CodeWithPrivateMethod.class, "doTheGamble", String.class, int.class)) .withArguments(anyString(), anyInt()) .thenReturn(true); /* 1 */ assertThat( PowerMock_Test.gambleCalled, is(false) ); spy.meaningfulPublicApi(); /* 2 */ assertThat( PowerMock_Test.gambleCalled, is(false) ); } } class CodeWithPrivateMethod { public void meaningfulPublicApi() { if (doTheGamble("Whatever", 1 &lt;&lt; 3)) { throw new RuntimeException("boom"); } } private boolean doTheGamble(String whatever, int binary) { Random random = new Random(System.nanoTime()); boolean gamble = random.nextBoolean(); System.err.println( "\n&gt;&gt;&gt; GAMBLE CALLED &lt;&lt;&lt;\n" ); PowerMock_Test.gambleCalled = true; return gamble; } } </code></pre> <p>^ understandably, since my workspace does not support JNDI, only the production environment does</p> <p>% I am using the latest versions of all the library, JUnit 4.10, Mockito 1.8.5, Hamcrest 1.1, Javassist 3.15.0, and PowerMock 1.4.10.</p>
 

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