Adding additional test cases for more coverage.

[vprusso]

Adding additional tests for:

• npa_hierarchy.py
• is_block_positive.py
• is_separable.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.7%. Comparing base (246a366) to head (768f7f5).
Report is 275 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #671   +/-   ##
======================================
  Coverage    97.7%   97.7%           
======================================
  Files         166     166           
  Lines        3250    3250           
  Branches      795     795           
======================================
+ Hits         3176    3177    +1     
  Misses         48      48           
+ Partials       26      25    -1     

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