Addons-frontend: Add functional UI tests

[jrbenny35]

@kumar303 was suggesting a suite of UI tests, similar to what is found on addons-server, but run within this repo.

I think this is a good idea and should be pretty straightforward as the config within addons-server is all set.

[jrbenny35]

I think these could run on circleci as we know that works and how to set it up best.

[jrbenny35]

Would it be wanted to run these locally?

[kumar303]

We discussed this over Vidyo. Here are some notes:

• We need functional tests for the addons.mozilla.org website, period. Thinking about it in terms of frontend/backend here is not relevant.
• We'd like for code changes in both addons-server and addons-frontend to trigger the tests
• We'd like pull requests to trigger the tests so we can detect breakage before hitting master
• The integration for both addons-server and addons-frontend should share as much configuration as possible
• We don't want to slow down pull request build times (I want a pony too ✨ )
• Other than adding yet another pull request builder perhaps there are viable alternatives
  
  
  
  • a separate repo to contain test files
  
  
  • something that runs in the background for each PR and just notifies devs of failures (like, by automatically opening an issue or something)
  
  
  • tests that are only run once a day
  
  
• Devs should be able to run the tests locally so they can help troublehsoot and fix breakage

[jrbenny35]

I am thinking maybe we could have a few different ways to run the tests. One that would setup everything from scratch, and maybe a set of instructions on running the tests with addons-server already cloned and the docker container already set up. Thoughts @kumar303 @krupa?

[kumar303]

Sure. We have to start somewhere so I say try something out with the goals from https://github.com/mozilla/addons-frontend/issues/4530#issuecomment-373156492 in mind.

[jrbenny35]

This is an attempt: https://circleci.com/gh/jrbenny35/addons-frontend/10

About 17min run time, which is...not short.