test_async: make test_async.py compatible with the pytest-flask plugin
this later depends on the presence of an 'app' fixture. See pytest_flask.plugin._monkeypatch_response_class() fixture for details.
Migrated from D2099 (view on Phabricator)
Staging instance, all changes can be removed at any time
this later depends on the presence of an 'app' fixture. See pytest_flask.plugin._monkeypatch_response_class() fixture for details.
Migrated from D2099 (view on Phabricator)