Test Against Reality

• Scientist

  18 7,344 1.9 Ruby

  :microscope: A Ruby library for carefully refactoring critical paths.

  

Something I've learned in Ruby land (prob standard in other places, forgive my ignorance) that seems a bit different than what the article advocates for (fake services):

- Write your service wrapper (eg your logic to interact with Twilio)

- Call the service and record API outputs, save those as fixtures that will be returned as responses in your tests without hitting the real thing (eg VCR, WebMock)

- You can now run your tests against old responses (this runs your logic except for getting a real response from the 3rd party; this approach leaves you exposed to API changes or you have edge cases not handled)

For the last part, two approaches to overcome this:

- Wrap any new logic in try/catch and report to Sentry: you avoid breaking prod and get info on new edge cases you didn't cover (this may not be feasible if the path where you're inserting new logic into does not work at all without the new feature; address this with thoughtful design/rollout of new features)

- Run new logic side by side to see what happens to the new logic when running in production (https://github.com/github/scientist)

I use the first approach bc small startup.

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