@Test
public void getNumberOfSentBroadcastMessages() {

    whenCall(retrofitMock.getNumberOfSentBroadcastMessages(any()),
             new NumberOfMessagesResponse(NumberOfMessagesResponse.Status.READY, 1024));
    NumberOfMessagesResponse response = target.getNumberOfSentBroadcastMessages("20181231").join();
    verify(retrofitMock, only()).getNumberOfSentBroadcastMessages("20181231");
    assertThat(response.getStatus()).isEqualTo(NumberOfMessagesResponse.Status.READY);
    assertThat(response.getSuccess()).isEqualTo(1024);
}