@Test public void parseTargetAddress_acceptsHostname() {

  when(span.isNoop()).thenReturn(false);
  HttpHost host = new HttpHost("1.2.3.4");
  TracingHttpAsyncClientBuilder.parseTargetAddress(host, span);
  verify(span).isNoop();
  verify(span).remoteIpAndPort("1.2.3.4", -1);
  verifyNoMoreInteractions(span);
}