@Test void ip_string_ipv4() {
    Endpoint.Builder newBuilder = Endpoint.newBuilder();
    assertThat(newBuilder.parseIp("43.0.192.2")).isTrue();
    Endpoint endpoint = newBuilder.build();

    assertExpectedIpv4(endpoint);
  }
Many getPort operations return -1 by default. Leniently coerse to null.
zipkin/src/test/java/zipkin2/EndpointTest.java