def test_command_line_interface():
    'Test the CLI.'
    runner = CliRunner()
    help_result = runner.invoke(cli.main, ['--help'])
    assert (help_result.exit_code == 0)
    assert ('Show this message and exit.' in help_result.output)
Test the CLI.
def test_command_line_interface():
    
    runner = CliRunner()
    help_result = runner.invoke(cli.main, ['--help'])
    assert (help_result.exit_code == 0)
    assert ('Show this message and exit.' in help_result.output)