Add tests for `Hash` impl (#214) #440

Job	Run time
miri (x86_64-unknown-linux-gnu)	53s
careful	1m 0s
coverage	22s
clippy	22s
rustfmt	7s
miri (s390x-unknown-linux-gnu)	1m 5s
doc	24s
test (stable)	43s
build (1.85.0, thumbv7em-none-eabi)	1m 21s
test (1.85.0)	52s
build (stable, wasm32-unknown-unknown)	1m 8s
build (1.85.0, armv7a-none-eabi)	1m 18s
build (stable, thumbv7em-none-eabi)	1m 26s
build (1.85.0, wasm32-unknown-unknown)	1m 29s
build (stable, armv7a-none-eabi)	1m 16s
	13m 46s

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