testcases.py 文件源码

def _pre_setup(self):
        """Performs any pre-test setup. This includes:

        * If the class has an 'available_apps' attribute, restricting the app
          registry to these applications, then firing post_migrate -- it must
          run with the correct set of applications for the test case.
        * If the class has a 'fixtures' attribute, installing these fixtures.
        """
        super(TransactionTestCase, self)._pre_setup()
        if self.available_apps is not None:
            apps.set_available_apps(self.available_apps)
            setting_changed.send(sender=settings._wrapped.__class__,
                                 setting='INSTALLED_APPS',
                                 value=self.available_apps,
                                 enter=True)
            for db_name in self._databases_names(include_mirrors=False):
                emit_post_migrate_signal(verbosity=0, interactive=False, db=db_name)
        try:
            self._fixture_setup()
        except Exception:
            if self.available_apps is not None:
                apps.unset_available_apps()
                setting_changed.send(sender=settings._wrapped.__class__,
                                     setting='INSTALLED_APPS',
                                     value=settings.INSTALLED_APPS,
                                     enter=False)

            raise