End-to-end testing example for pyngrok, full documentation found at https://pyngrok.readthedocs.io/en/latest/integrations.html

pyngrok_EndToEndTestingExample_pyngroktestcase.py

import unittest
import threading

from flask import request
from pyngrok import ngrok
from urllib import request

from server import create_app


class PyngrokTestCase(unittest.TestCase):
    # Default Flask port
    PORT = "5000"

    @classmethod
    def start_dev_server(cls):
        app = create_app()

        def shutdown():
            request.environ.get("werkzeug.server.shutdown")()

        @app.route("/shutdown", methods=("POST",))
        def route_shutdown():
            shutdown()
            return "", 204

        threading.Thread(target=app.run).start()

    @classmethod
    def stop_dev_server(cls):
        req = request.Request("http://localhost:5000/shutdown", method="POST")
        request.urlopen(req)

    @classmethod
    def init_webhooks(cls, base_url):
        webhook_url = "{}/foo".format(base_url)

        # ... Update inbound traffic via APIs to use the public-facing ngrok URL

    @classmethod
    def init_pyngrok(cls):
        # Open a ngrok tunnel to the dev server
        public_url = ngrok.connect(PORT)

        # Update any base URLs or webhooks to use the public ngrok URL
        cls.init_webhooks(public_url)

    @classmethod
    def setUpClass(cls):
        cls.start_dev_server()

        cls.init_pyngrok()

    @classmethod
    def tearDownClass(cls):
        cls.stop_dev_server()