test: Refactor test suite for `AppWorkspace` initialization in `formatters

[cyrinux]

• Add a new test for AppWorkspace::new in formatter.rs

[codecov[bot]]

Codecov Report

Merging #64 (5f4e654) into main (4f10976) will increase coverage by 0.29%. The diff coverage is n/a.

:exclamation: Current head 5f4e654 differs from pull request most recent head efe0bee. Consider uploading reports for the commit efe0bee to get more accurate results

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   54.62%   54.92%   +0.29%     
==========================================
  Files           6        6              
  Lines         335      335              
==========================================
+ Hits          183      184       +1     
+ Misses        152      151       -1     

Impacted Files	Coverage Δ
src/renamer/formatter.rs	94.38% <ø> (+1.12%)	:arrow_up:

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