mocking private static methods with PowerMock

[Max Ulanovskiy]

The problem is folow:
I need to test some public method which is calling private static method. To test them separately I want to mock the second one.
PowerMock has method

PowerMock.expectPrivate(ClassUnderTest.class, methodName)

to expect call of private static. Also we can mock selected method of object with

PowerMock.createPartialMock(ClassUnderTest.class, methodName)

and it works for simple private methods.


But how can I make my tested obj to call mocked class method instead of its reall class method?

[Ilja Preuss]

Make the private static method public and non-static. Seriously. Why would you not?

[Max Ulanovskiy]

Unfortunately I have no permissions to change this brainfack code. It's a legacy system. But I've found a solution. Perhaps it would be useful for somebody

@RunWith(PowerMockRunner.class)
@PrepareForTest(value = {ClassUnderTest.class})
MyTest
{
	@Test
	public void testSomePublicMethod()
	{
		ClassUnderTest instance = new ClassUnderTest();
		PowerMock.mockStatic(ClassUnderTest.class);
		PowerMock.expectPrivate(ClassUnderTest.class, "privateStaticMethodName");
		PowerMock.replay(ClassUnderTest.class);
		instance.somePublicMethod();
		//assertions go here 
		PowerMock.verify(ClassUnderTest.class);
	}
}