@contextmanager
    def temporary_migration_module(self, app_label='migrations', module=None):
        """
        Allows testing management commands in a temporary migrations module.

        Wrap all invocations to makemigrations and squashmigrations with this
        context manager in order to avoid creating migration files in your
        source tree inadvertently.

        Takes the application label that will be passed to makemigrations or
        squashmigrations and the Python path to a migrations module.

        The migrations module is used as a template for creating the temporary
        migrations module. If it isn't provided, the application's migrations
        module is used, if it exists.

        Returns the filesystem path to the temporary migrations module.
        """
        temp_dir = tempfile.mkdtemp()
        try:
            target_dir = tempfile.mkdtemp(dir=temp_dir)
            with open(os.path.join(target_dir, '__init__.py'), 'w'):
                pass
            target_migrations_dir = os.path.join(target_dir, 'migrations')

            if module is None:
                module = apps.get_app_config(app_label).name + '.migrations'

            try:
                source_migrations_dir = module_dir(import_module(module))
            except (__HOLE__, ValueError):
                pass
            else:
                shutil.copytree(source_migrations_dir, target_migrations_dir)

            with extend_sys_path(temp_dir):
                new_module = os.path.basename(target_dir) + '.migrations'
                with self.settings(MIGRATION_MODULES={app_label: new_module}):
                    yield target_migrations_dir

        finally:
            shutil.rmtree(temp_dir)
dataset/ETHPy150Open django/django/tests/migrations/test_base.py/MigrationTestBase.temporary_migration_module