public EndpointResponse getServerClusterId() {
    return EndpointResponse.ok(serverMetadata.getClusterId());
  }
@Test
  public void shouldReturnServerClusterId() {
    // When:
    final EndpointResponse response = serverMetadataResource.getServerClusterId();

    // Then:
    assertThat(response.getStatus(), equalTo(200));
    assertThat(response.getEntity(), instanceOf(ServerClusterId.class));
    final ServerClusterId serverClusterId = (ServerClusterId)response.getEntity();
    assertThat(
        serverClusterId,
        equalTo(ServerClusterId.of(KAFKA_CLUSTER_ID, KSQL_SERVICE_ID))
    );
  }