We use Python and Django for our websites. We set a test command that adds to the default Django test command:

from django.core.management.commands import test


class Command(test.Command):
    def add_arguments(self, parser):
        super().add_arguments(parser=parser)

        group = parser.add_argument_group('language options', 'These arguments are mutually exclusive. Default: --test-default-languages')
        language_group = group.add_mutually_exclusive_group()
        language_group.add_argument(
            "--test-all-languages",
            action="store_true",
            help="Run tests for all languages, and don't skip languages.",
        )
        language_group.add_argument(
            "--test-default-languages",
            action="store_true",
            help="Run tests for default languages (English, French, Hebrew + randomly select one more language or none).",
        )
        language_group.add_argument(
            "--test-only-english",
            action="store_true",
            help="Run tests for only English.",
        )

        # ...

Now, in the models we have this code:

    class SiteDiscoverRunner(DiscoverRunner):
        def __init__(self, *args, **kwargs):
            # ...
            super().__init__(*args, **kwargs)
            self.test_all_languages = kwargs.get('test_all_languages', False)
            self.test_default_languages = kwargs.get('test_default_languages', False)
            self.test_only_english = kwargs.get('test_only_english', False)
            if ((self.test_all_languages is False) and (self.test_only_english is False)):
                self.test_default_languages = True

Tests must be run with one of the above command line arguments or none. If none then the test_default_languages value should be true.

I would like to know if the parser can make self.test_default_languages True if none of the 3 arguments is given, so I can remove the command self.test_default_languages = True in the model? I searched and didn’t find out how to do it.