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    <p>From the <a href="http://code.google.com/p/powermock/wiki/MockitoUsage13#A_full_example_of_partial_mocking_of_a_private_method">PowerMock Private Method Example</a>:</p> <pre><code>@RunWith(PowerMockRunner.class) // We prepare PartialMockClass for test because it's final or we need to mock private or static methods @PrepareForTest(PartialMockClass.class) public class YourTestCase { @Test public void privatePartialMockingWithPowerMock() { PartialMockClass classUnderTest = PowerMockito.spy(new PartialMockClass()); // use PowerMockito to set up your expectation PowerMockito.doReturn(value).when(classUnderTest, "methodToMock", "parameter1"); // execute your test classUnderTest.execute(); // Use PowerMockito.verify() to verify result PowerMockito.verifyPrivate(classUnderTest, times(2)).invoke("methodToMock", "parameter1"); } </code></pre> <p>So to apply this to your code, I think it might become:</p> <pre><code>@RunWith(PowerMockRunner.class) @PrepareForTest(CodeWithPrivateMethod.class) public class PowerMock_Test { @Test(expected = RuntimeException.class) public void when_gambling_is_true_then_always_explode() throws Exception { CodeWithPrivateMethod spy = PowerMockito.spy(new CodeWithPrivateMethod()); PowerMockito.doReturn(true).when(spy, "doTheGamble", anyString(), anyInt()); /* 1 */ PowerMockito.verifyPrivate(spy, times(0)).invoke("doTheGamble", anyString(), anyInt()); spy.meaningfulPublicApi(); /* 2 */ PowerMockito.verifyPrivate(spy, times(2)).invoke("doTheGamble", anyString(), anyInt()); } } </code></pre> <p>I just coded that in the editor here. No tests have actually been run, and no bugs have been harmed in the crafting of this code.</p>
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    1. CO+1 for the no-harming of bugs. Very caring of you ;)
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    2. CO@Mike Do you have any idea why `doReturn(true).when(spy, "doTheGamble", anyString(), anyInt());` works but `doReturn( true ).when( spy, method( CodeWithPrivateMethod.class, "doTheGamble", String.class, int.class ) ).withArguments( anyString(), anyInt() ) ;` results in a `IllegalArgumentException: argument type mismatch` ? The latter seems more in keeping with the style of the example and at least equivalent but does not work.
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    3. COI honestly cannot, sorry. I'm relatively new to Mockito/PowerMock myself... I've never attempted writing code in that style (`.withArguments(...)`) before.
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