Added find_if and find_if_not tests

[nwad123]

Resolves #194

[nwad123]

Hi! This is my first time attempting to contribute to a project on GitHub so if I'm doing anything wrong please let me know! I followed some instructions I found online for submitting a pull request, and I'm not actually confident that I did it right, so if there is a better process I'd love to get a quick walkthrough.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (b07090f) to head (a0459ac).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   98.61%   98.62%           
=======================================
  Files          69       69           
  Lines        2608     2614    +6     
=======================================
+ Hits         2572     2578    +6     
  Misses         36       36           

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[tcbrindle]

This is very comprehensive, thank you! Just a couple of little comments -- the function statically testing find_if_not() should be called test_find_if_not(), and we want to run the static test functions at runtime as well.

Other than that, this looks great!

[nwad123]

Thanks! I fixed the naming and added the runtime tests.

[tcbrindle]

Merged, thank you very much @nwad123!