Improve test coverage for BlockLogicalIndex

[mtfishman]

I noticed #475 had some missing test coverage, this should fix that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.04%. Comparing base (a4a0b93) to head (970d2ca).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
+ Coverage   93.81%   94.04%   +0.23%     
==========================================
  Files          19       19              
  Lines        1761     1763       +2     
==========================================
+ Hits         1652     1658       +6     
+ Misses        109      105       -4     

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