More spectral data tests

[soswow]

Bring up test coverage to 82%

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.65%. Comparing base (79c91eb) to head (e59e1b1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
+ Coverage   81.44%   82.65%   +1.20%     
==========================================
  Files          11       11              
  Lines        2150     2150              
  Branches      325      325              
==========================================
+ Hits         1751     1777      +26     
+ Misses        399      373      -26     

see 1 file with indirect coverage changes

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