@Test
  public void should_increment_dropped_spans_when_message_sending_was_successful()
      throws Exception {
    Span span1 = Span.builder().build();
    Span span2 = Span.builder().build();
    Message<Spans> message =
        MessageBuilder.withPayload(new Spans(null, Arrays.asList(span1, span2))).build();

    this.tracerIgnoringChannelInterceptor.afterSendCompletion(
        message, this.messageChannel, false, null);

    BDDMockito.then(this.spanMetricReporter).should().incrementDroppedSpans(2);
  }