[PATCH v6 0/5] MR8862: mmdevapi/tests: Rewrite capturing tests, part 1/4.

[Giovanni Mascellani (＠giomasce)]

I began working on this to address some flakyness (see e.g. https://gitlab.winehq.org/wine/wine/-/jobs/183916), and eventually I ended up rewriting `test_capture()` because the previous implementation looked somewhat incomplete.

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  v6: mmdevapi/tests: Check that the received packet isn't larger than the padding.
      mmdevapi/tests: Check that GetBuffer() returns a packet of the expected size.
      mmdevapi/tests: Check that GetBuffer() fails when no packet is available.
      mmdevapi/tests: Introduce a helper to read many packets when capturing.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8862