Add jacoco for test coverage reporting in loader

[testower]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.56%. Comparing base (906e2b5) to head (6bca380).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #167      +/-   ##
============================================
- Coverage     72.81%   71.56%   -1.25%     
- Complexity      199      228      +29     
============================================
  Files            39       46       +7     
  Lines           938     1143     +205     
  Branches        113      128      +15     
============================================
+ Hits            683      818     +135     
- Misses          185      245      +60     
- Partials         70       80      +10     

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