Python: Click application + tests

click-example.py

import click

@click.group()
@click.pass_context
@click.argument('CHALLENGE', type=int)
def challenge(ctx, challenge):
    ctx.obj = challenge

@challenge.command()
@click.pass_obj
@click.argument('PHASE', type=int)
def phase1(ctx, phase):
    """Phase1 Command"""
    click.echo((phase))

@challenge.group(invoke_without_command=True, no_args_is_help=True)
@click.pass_obj
@click.argument('PHASE', type=int)
def phase2(ctx, phase):
    """Phase2 Group"""
    click.echo((phase))


if __name__ == "__main__":
    commands = (
        '--help',
        '1 phase1',
        '1 phase1 --help',
        '1 phase1 2 ',
        '1 phase1 2 --help',
        '1 phase2',
        '1 phase2 --help',
        '1 phase2 2 ',
        '1 phase2 2 --help',
        '--help',
    )

    import sys, time

    time.sleep(1)
    print('Click Version: {}'.format(click.__version__))
    print('Python Version: {}'.format(sys.version))
    for cmd in commands:
        try:
            time.sleep(0.1)
            print('-----------')
            print('> ' + cmd)
            time.sleep(0.1)
            challenge(cmd.split())

        except BaseException as exc:
            if str(exc) != '0' and \
                    not isinstance(exc, (click.ClickException, SystemExit)):
                raise