Add test

[peterdudfield]

Pull Request

Description

add some small tests on the loss, thought it might inspire other people to write tests

How Has This Been Tested?

Ran tests locally CI runs tests

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #37 (2575b9c) into main (5447341) will increase coverage by 3.33%. The diff coverage is n/a.

:exclamation: Current head 2575b9c differs from pull request most recent head 76b9c29. Consider uploading reports for the commit 76b9c29 to get more accurate results

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   68.77%   72.10%   +3.33%     
==========================================
  Files          12       12              
  Lines         839      839              
==========================================
+ Hits          577      605      +28     
+ Misses        262      234      -28     

Impacted Files	Coverage Δ
dgmr/losses.py	38.92% <0.00%> (+16.76%)	:arrow_up:

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