Tests

feat(Handler): Add ClearHandle #3299

Job	Run time
check no-default-features	17s
check serde	20s
check std	16s
clippy	1m 15s
docs	1m 12s
test stable --no-default-features	1m 5s
test no_std	19s
fmt	5s
test stable	1m 1s
test stable --all-features	1m 23s
test beta --no-default-features	58s
test beta	58s
test beta --all-features	1m 43s
test nightly --no-default-features	53s
test nightly	56s
test nightly --all-features	1m 33s
	14m 14s

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