Unit tests for MeshIndexSet.

[trexfeathers]

• Check raw code coverage
• Better use of fixtures for setting up tests
• Compare with Tests for indexing meshes #7218 for other coverage misses

[trexfeathers]

This is best understood by comparing to other metadata tests such as test_MeshMetadata.py ¹

Footnotes

1. the only differences should be resulting from the different memberships, and possibly some slight ordering differences. ↩

[trexfeathers]

• Should have a more thorough parameterisation of the three locations
• Should test whether the original MeshXY is all lazy connectivities/coords versus all NumPy versions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.42%. Comparing base (43b82f2) to head (b9b9214).
⚠️ Report is 5 commits behind head on FEATURE_index_set.

Additional details and impacted files

@@                  Coverage Diff                  @@
##           FEATURE_index_set    #7219      +/-   ##
=====================================================
+ Coverage              89.86%   90.42%   +0.56%     
=====================================================
  Files                     92       93       +1     
  Lines                  25573    25818     +245     
  Branches                4768     4795      +27     
=====================================================
+ Hits                   22980    23346     +366     
+ Misses                  1789     1693      -96     
+ Partials                 804      779      -25     

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[stephenworsley]

Looks good. My remaining concerns about test coverage (see here) would be better addressed in the integration tests.