test(postcss-normalize-url): improve normalize-url coverage

[ludofischer]

This is one of the biggest change for the 6.0 release, so I wanted to go though the tests to ensure I did not introduce any strange behaviour compared to the upstream package.

I think that if this looks fine we can release 6.0.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.57 🎉

Comparison is base (91a7cdb) 96.97% compared to head (aeaadaf) 97.54%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1483      +/-   ##
==========================================
+ Coverage   96.97%   97.54%   +0.57%     
==========================================
  Files         123      123              
  Lines       10138    10139       +1     
==========================================
+ Hits         9831     9890      +59     
+ Misses        307      249      -58     

Impacted Files	Coverage Δ
packages/postcss-normalize-url/src/normalize.js	92.81% <100.00%> (+38.20%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.