add test for and fix namede exceptions : GH #137

[newville]

fixes #137

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.7%. Comparing base (64a0556) to head (b57e8c0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #138   +/-   ##
======================================
  Coverage    95.6%   95.7%           
======================================
  Files           4       4           
  Lines        2041    2049    +8     
======================================
+ Hits         1953    1962    +9     
+ Misses         88      87    -1     

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