Clean up tests

[AshlinHarris]

No description provided.

[codecov]

Codecov Report

Merging #46 (997e5f7) into main (b357783) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 997e5f7 differs from pull request most recent head f972c6d. Consider uploading reports for the commit f972c6d to get more accurate results

@@            Coverage Diff            @@
##              main       #46   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           44        44           
=========================================
  Hits            44        44           

Impacted Files	Coverage Δ
src/PreprocessMD.jl	100.00% <100.00%> (ø)

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