Mocking behaviour resets after each test with PowerMock

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The method PowerMockito.mockStatic(...) invokes MockCreator.mock(...). This method regsiters a Runnable that will be executed after each test :

MockRepository.addAfterMethodRunner(new MockitoStateCleaner());

This runnable cleans the internal state of Mockito : 

private static class MockitoStateCleaner implements Runnable {
    public void run() {
        clearMockProgress();
        clearConfiguration();
    }

    private void clearMockProgress() {
        clearThreadLocalIn(ThreadSafeMockingProgress.class);
    }

    private void clearConfiguration() {
        clearThreadLocalIn(GlobalConfiguration.class);
    }

    private void clearThreadLocalIn(Class<?> cls) {
        Whitebox.getInternalState(cls, ThreadLocal.class).set(null);
        final Class<?> clazz = ClassLoaderUtil.loadClass(cls, ClassLoader.getSystemClassLoader());
        Whitebox.getInternalState(clazz, ThreadLocal.class).set(null);
    }
}

So you should execute your setUp before each test.

@Before
public void setUp() {
    PowerMockito.mockStatic(A.class);
    PowerMockito.when(A.getVal()).thenReturn("X");

    b = PowerMockito.mock(B.class);
    PowerMockito.when(b.getVal()).thenReturn("Y");
}

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