test: Extra tests for remote stylesheets

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9ce48a9) 85.59% compared to head (6e03ad1) 85.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #299 +/- ## ======================================= Coverage 85.59% 85.59% ======================================= Files 18 18 Lines 1735 1735 ======================================= Hits 1485 1485 Misses 250 250 ```

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #299 will not alter performance

_{Comparing dd/more-tests (6e03ad1) with master (9ce48a9)}

Summary

✅ 6 untouched benchmarks