tests

Improve stub in av.audio #1138

Job	Run time
py-3.8 lib-6.1 windows-latest	3m 16s
py-3.8 lib-6.1 ubuntu-latest	5m 16s
style	16s
package-source	21s
py-3.8 lib-6.0 ubuntu-latest	3m 59s
py-3.8 lib-6.0 windows-latest	3m 39s
py-3.8 lib-5.1 ubuntu-latest	4m 33s
py-3.8 lib-5.1 windows-latest	4m 6s
py-3.8 lib-5.0 ubuntu-latest	4m 16s
package-wheel (macos-latest, arm64)	18m 14s
py-3.8 lib-5.0 windows-latest	3m 33s
package-wheel (macos-latest, x86_64)	26m 0s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 32s
package-wheel (ubuntu-latest, aarch64)	3h 24m 9s
py-3.8 lib-6.1 macos-latest	7m 57s
package-wheel (ubuntu-latest, i686)	22m 30s
package-wheel (ubuntu-latest, x86_64)	21m 21s
package-wheel (windows-latest, AMD64)	15m 28s
publish	41s
	5h 54m 7s

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