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Java Testing Notes
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PrepareForTest

Mark this class for bytecode manipulation
Each class you add in @PrepareForTest will generate an different bytecode that can be manipulated by PowerMock.
@RunWith(PowerMockRunner.class)
@PrepareForTest({
StaticClass.class,
FinalClass.class,
ClassWithFinalMethod.class
})
public class ClassToTest {
}
PreparingForTest unlocks class for a wide variety of things such as mocking final classes, classes with final, private, static or native methods that should be mocked and also classes that should be return a mock object upon instantiation.
You can read more about what @PrepareForTest unlocks from here