add codecov test

[stevenysw]

No description provided.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@67c66e9). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   42.42%           
=========================================
  Files             ?        9           
  Lines             ?       99           
  Branches          ?        0           
=========================================
  Hits              ?       42           
  Misses            ?       57           
  Partials          ?        0

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[sckott]

thanks @steven2249