PowerMock static class does not mock

Question

public class TestStatic {
    public static int methodstatic(){
        return 3;
    }
}


@Test
@PrepareForTest({TestStatic.class})
public class TestStaticTest extends PowerMockTestCase {

    public void testMethodstatic() throws Exception {
        PowerMockito.mock(TestStatic.class);
        Mockito.when(TestStatic.methodstatic()).thenReturn(5);
        PowerMockito.verifyStatic();
        assertThat("dff",TestStatic.methodstatic()==5);
    }

    @ObjectFactory
    public IObjectFactory getObjectFactory() {
        return new org.powermock.modules.testng.PowerMockObjectFactory();
    }
}

The exception :

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
    when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
Those methods *cannot* be stubbed/verified.
2. inside when() you don't call method on mock but on some other object.

I am running it through Intellij, the legacy code has plenty of methods...

Someone has and idea, I went through the official tuto, no mean to make this simple test working

Answer 1

I found the solution for such issue in my case, want to share it with you:

If I called the mocked method in the test class:

@RunWith(PowerMockRunner.class)
@PrepareForTest(Calendar.class)
public class TestClass {
  @Test
  public void testGetDefaultDeploymentTime()
    PowerMockito.mockStatic(Calendar.class);
    Calendar calendar = new GregorianCalendar();
    calendar.set(Calendar.HOUR_OF_DAY, 8);
    calendar.set(Calendar.MINUTE, 0);
    when(Calendar.getInstance()).thenReturn(calendar);
    Calendar.getInstance();
  }
}

it worked just fine. But when I rewrited test so it called Calendar.getInstance() in another class it used the real Calendar method.

@Test
public void testGetDefaultDeploymentTime() throws Exception {
  mockUserBehaviour();
  new AnotherClass().anotherClassMethodCall();    // Calendar.getInstance is called here
}

So, as a solution I added AnotherClass.class to @PrepareForTest and it works now.

@PrepareForTest({Calendar.class, AnotherClass.class})

It seems PowerMock needs to know where mocked static method will be called.