Adds 'circular' tests for the two branches present

[Matt-Carre]

Fixes #2042

This adds tests that check that f(g(x)) == g(f(x)), where f and g are inverses of each other (e.g., f=converting cm to mm, g=converting mm to cm), and x is an input value.

Also adds in Bools when not included.

[Matt-Carre]

This will be expanded once #2049 is merged into main.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.12%. Comparing base (edfa7d6) to head (dd54869).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2060   +/-   ##
=======================================
  Coverage   99.12%   99.12%           
=======================================
  Files         336      336           
  Lines       13073    13073           
=======================================
  Hits        12959    12959           
  Misses        114      114           

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