Add a test command to web ui

[johnynek]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (b73c2b9) 92.30% compared to head (3ef3c9a) 92.26%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
core/src/main/scala/org/bykn/bosatsu/Test.scala	44.00%	14 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1136      +/-   ##
==========================================
- Coverage   92.30%   92.26%   -0.05%     
==========================================
  Files          96       96              
  Lines       11037    11041       +4     
  Branches     2597     2597              
==========================================
- Hits        10188    10187       -1     
- Misses        849      854       +5     

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