tests

Add missing stubs for AudioFrame #1225

Job	Run time
package-source	26s
package-wheel (macos-latest, arm64)	21m 48s
py-3.9 lib-6.1 ubuntu-latest	5m 18s
package-wheel (macos-latest, x86_64)	20m 58s
style	17s
py-3.9 lib-6.0 ubuntu-latest	4m 8s
package-wheel (ubuntu-latest, aarch64)	2h 39m 30s
py-3.9 lib-5.1 ubuntu-latest	4m 57s
package-wheel (ubuntu-latest, i686)	17m 17s
py-3.9 lib-6.1 windows-latest	4m 9s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 33s
package-wheel (ubuntu-latest, x86_64)	16m 35s
py-3.9 lib-6.1 macos-latest	5m 44s
package-wheel (windows-latest, AMD64)	14m 6s
py-3.9 lib-6.0 windows-latest	3m 7s
py-3.9 lib-5.1 windows-latest	4m 2s
publish	34s
	4h 47m 29s

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