Add unit test for check subcommand

[nao1215]

No description provided.

[codecov]

Codecov Report

Merging #40 (5d5c188) into main (e66a501) will decrease coverage by 52.68%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##              main      #40       +/-   ##
============================================
- Coverage   100.00%   47.31%   -52.69%     
============================================
  Files            2       10        +8     
  Lines           34      279      +245     
============================================
+ Hits            34      132       +98     
- Misses           0      145      +145     
- Partials         0        2        +2     

Impacted Files	Coverage Δ
cmd/root.go	100.00% <ø> (ø)
cmd/check.go	90.74% <85.71%> (ø)
cmd/list.go	100.00% <100.00%> (ø)
cmd/version.go	100.00% <0.00%> (ø)
cmd/update.go	13.95% <0.00%> (ø)
cmd/export.go	4.00% <0.00%> (ø)
cmd/import.go	11.76% <0.00%> (ø)
... and 1 more

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