@Test
public void testMainHelp() throws Exception {

    Help help = new Help();
    String output = help.execute(Mockito.mock(CommandContext.class), null);
    assertThat(output, containsString("greeting"));
    assertThat(output, containsString("help"));
    assertThat(output, containsString("ls"));
    assertThat(output, containsString("online"));
    assertThat(output, containsString("offline"));
    assertThat(output, containsString("quit"));
}