[#26] Update tests to use CommandTestCase and update coverage

[tannguyen04]

closes #26

Checklist before requesting a review

• I have formatted the subject to include ticket number
  as [#-123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was
  done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and
  they passed
• I have provided screenshots, where applicable

Changed

• Need to update tests to use CommandTester
• Also, need to update the tests's namespace to follow namespace YourNamespace\App\Tests\Unit\Command
• And also need to move the command into src/Command dir.

Screenshots

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (539d87f) 29.40% compared to head (f0119bb) 30.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   29.40%   30.00%   +0.59%     
==========================================
  Files          23       23              
  Lines         551      550       -1     
==========================================
+ Hits          162      165       +3     
+ Misses        389      385       -4     

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