[audio] Improve test coverage for audio losses

[anteju]

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What does this PR do ?

This PR adds additional tests for audio losses to improve test coverage.

Collection: audio

Changelog

• Adds several unit tests to improve test coverage

Usage

N/A

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• [ ] Bugfix
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Additional Information

• Related to # (issue)

[racoiaws]

LGTM but need to fix dosctrings/comments; will add some confusion it case these tests ever fail