    @Test public void When_Execute_Get_User() {

        when(userDemoRepositoryMock.getSelectedUserDemoList()).thenReturn(Observable.just(userDemoEntityMock));

        TestSubscriber<UserDemoEntity> subscriberMock = new TestSubscriber<>();
        getSelectedDemoUserListUseCaseUT.react().subscribe(subscriberMock);
        subscriberMock.awaitTerminalEvent();

        assertThat(subscriberMock.getOnCompletedEvents().size(), is(1));
    }