Code Tests

Implement the `once` method on Evented. #995

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Job	Run time
run (ubuntu-latest, 3.9)	1m 15s
run (ubuntu-latest, 3.13)	1m 4s
run (windows-latest, 3.9)	5m 43s
run (windows-latest, 3.13)	5m 58s
	14m 0s