Update CONTRIBUTING.md

[breedx-splk]

This adds some additional guidance about assertions, mocking, and the PR process.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.76%. Comparing base (a39035b) to head (1e5e100).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1425      +/-   ##
==========================================
+ Coverage   63.65%   63.76%   +0.10%     
==========================================
  Files         159      159              
  Lines        3134     3146      +12     
  Branches      326      325       -1     
==========================================
+ Hits         1995     2006      +11     
- Misses       1042     1043       +1     
  Partials       97       97              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gregory-at-cvs]

Good updates @breedx-splk 👍.

I left a heads up about a misspelled word and a question. Let me know after you've added a response or change and I'll schedule in time to review.

[breedx-splk]

Thanks for the review, @gregory-at-cvs. 👍🏻

[gregory-at-cvs]

Thanks for the review, @gregory-at-cvs. 👍🏻

You're welcome @breedx-splk.

[fractalwrench]

LGTM