assertThrows(IllegalArgumentException.class, () -> HostAndPort.fromHost("gmail.com:80"));

    assertThrows(IllegalArgumentException.class, () -> HostAndPort.fromHost("[gmail.com]"));
  }

  public void testGetPortOrDefault() {
    assertEquals(80, HostAndPort.fromString("host:80").getPortOrDefault(123));
    assertEquals(123, HostAndPort.fromString("host").getPortOrDefault(123));
  }

  public void testHashCodeAndEquals() {