PowerMockito: NotAMockException on a mock

Question

Bit of a complicated setup. Robolectric, PowerMockito rule-based config.

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sd         


        

Answer 1

I ran into this problem too. There is actually an issue on the PowerMock project: https://github.com/jayway/powermock/issues/593

But no comments from any of the powermock developers.

Answer 2

I cannot build your example, but I managed to write this minitest that produces a very similar problem:

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*"})
@PrepareOnlyThisForTest({ServiceCallbackBase.class, Dummy.class})
public class MainActivityTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();

    @Test
    public void test1() throws Exception {
        try {
            //This Mockito.withSettings() thing is important to make the test fail!
            ServiceCallbackBase callback = PowerMockito.mock( ServiceCallbackBase.class, Mockito.withSettings());

            callback.dispatchMessage(null);
            Mockito.verify(callback).dispatchMessage(null);

        } catch (Exception e){
            e.printStackTrace();
            Assert.fail();
        }
    }
}

(Note the Mockito.withSettings(), I don't know why but that makes the test to fail)

Prints:

org.mockito.exceptions.misusing.NotAMockException: 
    Argument passed to verify() is of type ServiceCallbackBase$$EnhancerByMockitoWithCGLIB$$62776c54 and is not a mock!
    Make sure you place the parenthesis correctly!
    ......

Well, this absolutely looks as a classloading issue, mockito is comparing ServiceCallbackBase$$EnhancerByMockitoWithCGLIB$$etc.. loaded by Powermock with the same loaded by Robolectric (obviously returning false in that comparision)

Then, I managed to make the test work simply adding "org.powermock.*"to the line @PowerMockIgnore... this is:

@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*", "org.powermock.*"})

This simple change made my test to work, and I really hope that make yours too.