[Python] How to test command line parser click

what's this

When you create a console app that uses click in Python, you sometimes want to test whether the parameters are passed properly. With CliRunner, you can test your application with click.

Basic example

import click
from click.testing import CliRunner

def test_hello_world():
    @click.command()
    @click.argument('name')
    def hello(name):
        click.echo('Hello %s!' % name)

    runner = CliRunner()
    result = runner.invoke(hello, ['Peter'])
    assert result.exit_code == 0
    assert result.output == 'Hello Peter!\n'

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