@Test
public void shouldNotReturnAnyServer() throws Exception {

  when(mockServerSearchManager.searchServer()).thenReturn(Observable.never());
  Observable<Server> serverObservable = networkActionProvider.searchServer();
  TestObserver<Server> testObserver = serverObservable.test();
  testObserver.assertEmpty();
  testObserver.assertNotComplete();
  verify(mockServerSearchManager, times(1)).searchServer();
  verifyZeroInteractions(mockServerEntityDataMapper);
  verifyNoMoreInteractions(mockServerSearchManager);
}