@Test
public void shouldBuildReactiveStreamForEmptyParams() throws Exception {

  SearchServerInteractor.Params emptyParams = SearchServerInteractor.Params.empty();
  searchServerInteractor.buildReactiveStream(emptyParams);
  verify(searchServerService).searchServer();
  verifyNoMoreInteractions(searchServerService);
  verifyZeroInteractions(mockThreadExecutor);
  verifyZeroInteractions(mockPostExecutionThread);
}