test: refactor and extend tests

[KnorpelSenf]

Improves the test setup and add test for most of InputFile.

[codecov]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.72 🎉

Comparison is base (299ca4e) 34.95% compared to head (69a5072) 35.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
+ Coverage   34.95%   35.68%   +0.72%     
==========================================
  Files          16       16              
  Lines        4806     4809       +3     
  Branches      168      178      +10     
==========================================
+ Hits         1680     1716      +36     
+ Misses       3124     3092      -32     
+ Partials        2        1       -1     

Impacted Files	Coverage Δ
src/platform.deno.ts	90.90% <50.00%> (+9.09%)	⬆️
src/types.deno.ts	94.11% <100.00%> (+38.02%)	⬆️

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