add unit tests for cmd/main.go and cmd/run.go

[chengfang]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.98%. Comparing base (bb6280d) to head (9265482).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #764      +/-   ##
==========================================
+ Coverage   56.15%   59.98%   +3.82%     
==========================================
  Files          31       31              
  Lines        3109     3109              
==========================================
+ Hits         1746     1865     +119     
+ Misses       1223     1100     -123     
- Partials      140      144       +4     

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