adds tests for #73

[m00sey]

see my comments here: https://github.com/WebOfTrust/vLEI/issues/73#issuecomment-1373071657

[codecov-commenter]

Codecov Report

Merging #74 (72228a6) into dev (3ce1dea) will increase coverage by 5.21%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #74      +/-   ##
==========================================
+ Coverage   29.71%   34.93%   +5.21%     
==========================================
  Files           9        9              
  Lines         212      229      +17     
==========================================
+ Hits           63       80      +17     
  Misses        149      149              

Impacted Files	Coverage Δ
tests/test_schema.py	100.00% <100.00%> (ø)

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[m00sey]

Close #73