@Test
void startTimeEquals() {

    Instant now = Instant.now();
    domainBuilder.topicMessage(t -> t.consensusTimestamp(now)).block();
    TopicMessageFilter filter = TopicMessageFilter.builder()
            .startTime(now)
            .build();
    pollingTopicMessageRetriever.retrieve(filter)
            .map(TopicMessage::getSequenceNumber)
            .as(StepVerifier::create)
            .expectNext(1L)
            .thenCancel()
            .verify(Duration.ofMillis(500));
}