How to mock flask.g and Flask-RESTful.request while working outside request context

Solution

def test_authenticate():
    with flask.Flask(__name__).test_request_context() as flask_context:
        flask_context.request.headers = {"by-pass": "internal-bypass-key"}

        @auth.Auth.authenticate
        def test_func(*args, **kwargs):
            return "hello"

        assert test_func(2, 3, 4, multiplier=2) == "hello"
        assert flask_context.g.user == "by_pass"