How to mock external services?

[rdmolony]

Hi there, I have a dodgy streamlit app that depends on a response from an external service. I'm struggling to mock this service in my Selenium functional tests. Trawling stackexchange & the Selenium docs it seems best practice is mocking this response using a proxy.

Is there a SeleniumBase best practice for this?

(SeleniumBase is great btw, thanks!)

---

The stackexchange answer recommends browsermob-proxy-py (last commit 2018):

import browsermobproxy
import selenium.webdriver as driver
import time

website_homepage_url = "http://www.python.org"

server = browsermobproxy.Server("C:\Users\johnsmith\Computer_Code\\browsermob-proxy-2.1.0-beta-1\\bin\\browsermob-proxy")
server.start()
proxy = server.create_proxy()

profile = driver.FirefoxProfile()
profile.set_proxy(proxy.selenium_proxy())
browser = driver.Firefox(firefox_profile=profile)

proxy.new_har("Python.org")
proxy.rewrite_url(website_homepage_url, 'http://localhost:8000/Fake_Search_Results_Page.html')
browser.get(website_homepage_url)

time.sleep(10)

proxy.har  # returns a HAR JSON blob

server.stop()
browser.quit()

[mdmintz]

Hello @rdmolony, SeleniumBase allows you to set a proxy server when running tests, which you can use together with the browsermobproxy. There are two ways to set the proxy.
1: From the command-line with pytest:
--proxy="server:port"
2: By spinning up a new driver from within a test:
driver2 = self.get_new_driver(proxy="server:port")
If authentication is required, you can expand that format to user:pass@server:port.
If using option 2, all self.* methods will automatically start using the new driver that you have spun up. Assuming that you have correctly set up your proxy server, the web browser will use that while tests are running.

[rdmolony]

Awesome, thanks a lot @mdmintz! I saw your CLI flag in your wonderful docs & get_new_driver is intuitive ;) Do you have any preferred proxy library?

[mdmintz]

@rdmolony, Excellent. :) I don't have any preferred proxy libraries... I've generally connected to existing proxy servers as needed via the above options.

[rdmolony]

I've since found this library wkeeling/selenium-wire which does exactly what I was looking for