Test README

Add `DataValidity` property #1456

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Run time

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Job	Run time
readme (3.8, ubuntu-latest)	55s
readme (3.8, macos-latest)	1m 5s
readme (3.9, ubuntu-latest)	59s
readme (3.9, macos-latest)	1m 5s
readme (3.10, ubuntu-latest)	48s
readme (3.10, macos-latest)	1m 27s
readme (3.11, ubuntu-latest)	53s
readme (3.11, macos-latest)	1m 30s
	8m 42s