Flask, flask_login, pytest: How do I set flask_login's current_user?

I am trying to use pytest to unit test my Flask app. I have the following test case for an endpoint that requires information from flask_login's current_user:

def test_approval_logic():
    with app.test_client() as test_client:
        app_url_put = '/requests/process/2222'

        with app.app_context():
            user = User.query.filter_by(uid='xxxxxxx').first()
            with app.test_request_context():
                login_user(user)
                user.authenticated = True
                db.session.add(user)

                data = dict(
                    state='EXAMPLE_STATE_NAME',
                    action='approve'
                )
                resp = test_client.put(app_url_put, data=data)
                assert resp.status_code == 200

Inside the test_request_context, I am able to set current_user correctly. However, this test fails because in the requests view where the PUT is handled, there is no logged in user and 500 error results. The error message is, AttributeError: 'AnonymousUserMixin' object has no attribute 'email'. Can someone explain why current_user goes away and how I can set it correctly?

from Flask, flask_login, pytest: How do I set flask_login's current_user?