Added a few more eig/eigh/svd tests

[kshyatt]

Just trying to boost coverage a little

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.02%. Comparing base (dd820ff) to head (6813a77).
⚠️ Report is 2 commits behind head on matrixalgebra.

Additional details and impacted files

@@                Coverage Diff                @@
##           matrixalgebra     #271      +/-   ##
=================================================
+ Coverage          77.96%   78.02%   +0.05%     
=================================================
  Files                 49       49              
  Lines               5760     5760              
=================================================
+ Hits                4491     4494       +3     
+ Misses              1269     1266       -3     

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