Classes extend BiocObject, update tests

[jkanche]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.30%. Comparing base (fffe203) to head (17b6736).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/iranges/base.py	92.59%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   67.94%   71.30%   +3.35%     
==========================================
  Files           5        5              
  Lines         914      892      -22     
  Branches      168      165       -3     
==========================================
+ Hits          621      636      +15     
+ Misses        215      168      -47     
- Partials       78       88      +10     

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