Resolve an issue with empty test for training cache

[lhjohn]

Resolves #79

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (31ef832) 99.01% compared to head (99615b0) 99.01%.
Report is 1 commits behind head on develop.

❗ Current head 99615b0 differs from pull request most recent head 24e7110. Consider uploading reports for the commit 24e7110 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #84   +/-   ##
========================================
  Coverage    99.01%   99.01%           
========================================
  Files            9        9           
  Lines          408      408           
========================================
  Hits           404      404           
  Misses           4        4           

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[egillax]

Thanks! merging