def METHOD_NAME(click_runner, random_day, events, stock_pictures, slack_mock, settings):
    settings.ENABLE_SLACK_NOTIFICATIONS = True
    assert Event.objects.count() == 4
    command_input = (
        "Oz\n" "Neverland\n" f"{random_day}\n" "oz\n" "oz\n" "Jan Kowalski\n" "jan@kowalski.example.org\n" "N\n"
    )
    result = click_runner.invoke(new_event, args=["--short"], input=command_input, catch_exceptions=False)
    assert Event.objects.count() == 5
    short_email_body = "Event e-mail is: oz@djangogirls.org\n" "Event website address is: https://djangogirls.org/oz"
    assert short_email_body in result.output
    slack_mock.chat_postMessage.assert_called_once()