@Test
public void testGroupCommand() {

    CommandLineParser<CommandInvocation> parser = getParser(GutCommand1.class);
    FileCompleterGenerator completerGenerator = new FileCompleterGenerator();
    String out = completerGenerator.generateCompleterFile(parser);
    assertTrue(out.contains("_complete_gut"));
    assertTrue(out.contains("_command_gut"));
    assertTrue(out.contains("_command_help"));
    assertTrue(out.contains("_command_rebase"));
    assertTrue(out.contains("ArrContains"));
    assertTrue(out.contains("ArrContains COMP_WORDS CHILD0 && { _command_help; return $?; }"));
}