@Test
public void testInvalidPort2() {

    String[] args = new String[]{"--port", "wahaha"};
    ParseCommandLineArgsResult ret = Bootstrap.parseCommandLineArgs(args);
    assertThat(ret.isExit()).isTrue();
    assertThat(ret.getExitCode()).isEqualTo(ExitCode.USAGE);
    assertThat(ret.getOptions()).isNull();
}