replace vitest-fetch-mock with msw

[vipentti]

Changes

• replaces vitest-fetch-mock with msw in openapi-fetch tests (including index.bench.js)

Fixes #1581

How to Review

I've made an effort to keep the existing tests as close as possible to their original implementation, with the exception of replacing mockFetch* with the equivalent msw test handler. Due to msw, it's necessary to pass baseUrl around to ensure we're using the correct request URLs. Therefore, it has been provided for each createClient and equivalent test handler.

Please note, the current usage of msw contradicts msw's best practices (Avoid Request Assertions). However, given the nature of this library, I believe this approach is acceptable in this context. In most of these tests, we aim to validate that the client is indeed calling the expected handler with the expected request parameters.

Checklist

• Unit tests updated
• docs/ updated (if necessary)

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[drwpow]

This is a great PR, thank you! Very in favor of this direction—I had been wanting to do this but you beat me to it.

I’m not so much particular about the test setup details, so long as the tests themselves don’t change.

[vipentti]

I don't have permissions to merge this, feel free to do so :)

[drwpow]

This is great, thanks again!

[jshike]

got an ETA for this to be published?

[drwpow]

@jshike this is for testing; there’s nothing to publish