tests(fetch): add test coverage

[Ruffpuff1]

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[codecov]

Codecov Report

Merging #323 (6c9c6c9) into main (d99b800) will increase coverage by 8.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   81.69%   90.14%   +8.45%     
==========================================
  Files           7        7              
  Lines         213      213              
  Branches       46       46              
==========================================
+ Hits          174      192      +18     
+ Misses         32       14      -18     
  Partials        7        7              

Impacted Files	Coverage Δ
packages/fetch/src/Request.ts	97.05% <0.00%> (+17.64%)	⬆️

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