tests

Add stub for buffer, descriptor, plane #1117

Job	Run time
py-3.8 lib-6.1 ubuntu-latest	5m 17s
py-3.8 lib-6.0 ubuntu-latest	4m 6s
style	22s
py-3.8 lib-5.1 ubuntu-latest	4m 58s
py-3.8 lib-5.0 ubuntu-latest	4m 19s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 46s
py-3.8 lib-6.1 macos-latest	11m 24s
package-source	25s
package-wheel (macos-latest, arm64)	2m 5s
py-3.8 lib-6.1 windows-latest	3m 11s
package-wheel (macos-latest, x86_64)	5m 59s
py-3.8 lib-6.0 windows-latest	3m 39s
package-wheel (ubuntu-latest, aarch64)	2m 6s
py-3.8 lib-5.1 windows-latest	3m 59s
package-wheel (ubuntu-latest, i686)	1m 52s
package-wheel (ubuntu-latest, x86_64)	1m 3s
py-3.8 lib-5.0 windows-latest	3m 47s
package-wheel (windows-latest, AMD64)	1m 14s
publish	1s
	1h 4m 33s

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