@Test
public void testBuildUseCaseObservableReturnCorrectResult() {

    TestSubscriber<Integer> testSubscriber = new TestSubscriber<>();
    TestScheduler testScheduler = new TestScheduler();
    BDDMockito.given(mockPostExecutionThread.getScheduler()).willReturn(testScheduler);
    mUseCase.execute(testSubscriber);
    MatcherAssert.assertThat(testSubscriber.getOnNextEvents().size(), Is.is(0));
}