test(core): add coverage for new routines

[imrn99]

Description

Scope: core

Type of change: test

Content description: title

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.00000% with 28 lines in your changes missing coverage. Please review.

Project coverage is 85.14%. Comparing base (001af13) to head (22921e5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
honeycomb-core/src/cmap/dim2/tests.rs	94.42%	16 Missing ⚠️
honeycomb-core/src/cmap/dim3/tests.rs	96.91%	8 Missing ⚠️
honeycomb-core/src/cmap/dim3/sews/one.rs	60.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #267       +/-   ##
===========================================
+ Coverage   74.55%   85.14%   +10.58%     
===========================================
  Files          62       62               
  Lines        8611     8924      +313     
===========================================
+ Hits         6420     7598     +1178     
+ Misses       2191     1326      -865     

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