Add 4 extra tests for edge cases

[tiangolo]

✅ Add 4 extra tests for edge cases.

[codecov-io]

Codecov Report

Merging #32 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   99.96%   99.96%   +<.01%     
==========================================
  Files         165      166       +1     
  Lines        2887     2920      +33     
==========================================
+ Hits         2886     2919      +33     
  Misses          1        1

Impacted Files	Coverage Δ
tests/test_others.py	100% <100%> (ø)

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