Update DataReader implementation & added tests

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.22%. Comparing base (6d8282d) to head (256dda7).
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #498      +/-   ##
============================================
+ Coverage     59.02%   59.22%   +0.19%     
- Complexity     2218     2223       +5     
============================================
  Files           327      327              
  Lines         13429    13455      +26     
  Branches       1339     1344       +5     
============================================
+ Hits           7927     7969      +42     
+ Misses         4878     4872       -6     
+ Partials        624      614      -10     

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