Tests

chore: add helper function for spec id #2746

Job	Run time
check serde	29s
check no-default-features	19s
test stable --no-default-features	2m 51s
test no_std	17s
test stable	53s
test stable --all-features	1m 16s
check std	17s
test beta --no-default-features	46s
clippy	1m 15s
test beta	53s
test beta --all-features	1m 8s
docs	1m 18s
test nightly --no-default-features	2m 8s
test nightly	2m 2s
test nightly --all-features	2m 6s
fmt	1m 7s
	19m 5s

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