test: add test case for ParseCompletionForShell

[JacksonTian]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8b36347) 83.15% compared to head (ec2cca4) 83.28%.
Report is 1 commits behind head on master.

❗ Current head ec2cca4 differs from pull request most recent head fa20419. Consider uploading reports for the commit fa20419 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #877      +/-   ##
==========================================
+ Coverage   83.15%   83.28%   +0.12%     
==========================================
  Files          47       47              
  Lines        3236     3236              
==========================================
+ Hits         2691     2695       +4     
+ Misses        414      411       -3     
+ Partials      131      130       -1     

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