FIX: Remove implementation of an abstract class

[oesteban]

Resolves: #198.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.22%. Comparing base (a03c51f) to head (0831499).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   95.24%   95.22%   -0.02%     
==========================================
  Files          16       16              
  Lines        1976     1969       -7     
  Branches      266      266              
==========================================
- Hits         1882     1875       -7     
  Misses         75       75              
  Partials       19       19              

Flag	Coverage Δ
unittests	95.04% <100.00%> (-0.02%)	⬇️

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