chore: E2E Test Support

[jamescarr]

This PR

• adds support to run tests in https://github.com/open-feature/test-harness

Related Issues

Fixes #99

Notes

Follow-up Tasks

How to test

[jamescarr]

This simply provides the scaffolding:

• test-harness submodule
• python step definitions that raise NotImplemented
• Makefile target to run them: make e2e
  

[toddbaert]

Awesome work @jamescarr !

I know this is just a draft for now, but it's great to see the cuke parsing/testing working.

[federicobond]

@jamescarr do you mind if I take a look at this and see if I can get it to work with the new InMemoryProvider?

[codecov]

Codecov Report

Merging #132 (097eafe) into main (5e7bf1f) will increase coverage by 0.33%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   93.83%   94.16%   +0.33%     
==========================================
  Files          23       25       +2     
  Lines         438      463      +25     
==========================================
+ Hits          411      436      +25     
  Misses         27       27              

Flag	Coverage Δ
unittests	94.16% <100.00%> (+0.33%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
open_feature/open_feature_client.py	95.91% <ø> (ø)
open_feature/provider/in_memory_provider.py	98.14% <100.00%> (+0.07%)	⬆️

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[federicobond]

Rebased against latest main after checking in with @jamescarr and managed to get the evaluation tests to pass with an InMemoryProvider.

I had to fix a couple of minor issues with the design of the provider and also found a bug in the typechecking for python<3.10.

[toddbaert]

Largely LGTM, I have a couple minor comments/questions.

I changed the title to "chore" since this doesn't appear to be an "end-user"-facing feature... it's more of a feature for us as OpenFeature devs.

Thanks to both if you for your efforts. Much appreciated as always 🙏 @federicobond @jamescarr