Feature/enhance accessor test coverage and helper test coverage

[To-Ki-O]

• accessor.ts

  • add test which type "dim uninstall" before "dim init" to check the uninstall action without dim.json
  • delete undefined from Union type dimJSON and delete the checks if dimJSON is undefined

• helper.ts

  • delete the check if the inside of temporary directory is blank

I have already done action comfirmation

• dim install (from URL)
• dim install (from dim.json)

[codecov]

Codecov Report

Merging #92 (1368e24) into main (056e3c7) will increase coverage by 1.17%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #92      +/-   ##
===========================================
+ Coverage   98.82%   100.00%   +1.17%     
===========================================
  Files          18        18              
  Lines        1282      1261      -21     
  Branches      133       127       -6     
===========================================
- Hits         1267      1261       -6     
+ Misses         15         0      -15     

Impacted Files	Coverage Δ
tests/helper.ts	100.00% <ø> (+6.00%)	⬆️
libs/accessor.ts	100.00% <100.00%> (+7.45%)	⬆️

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