Test README

Add `KeyUniqueness` metric #1414

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Run time

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Job	Run time
readme (3.8, ubuntu-latest)	1m 2s
readme (3.8, macos-latest)	1m 13s
readme (3.9, ubuntu-latest)	47s
readme (3.9, macos-latest)	1m 14s
readme (3.10, ubuntu-latest)	46s
readme (3.10, macos-latest)	1m 13s
readme (3.11, ubuntu-latest)	47s
readme (3.11, macos-latest)	1m 2s
	8m 4s