Add vaargs test case

[bkryza]

Fixes #342

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.70%. Comparing base (644e4a0) to head (f29a9fe).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   90.69%   90.70%           
=======================================
  Files         136      136           
  Lines       16827    16830    +3     
=======================================
+ Hits        15262    15265    +3     
  Misses       1565     1565           

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