Tests

Replace `block` module with helper functions #62

Job	Run time
Check doc	13s
Check Clippy and rustfmt	16s
test-miri	32s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	49s
test-no-std	13s
test (macos-latest, x86_64-apple-darwin, stable)	27s
test (windows-latest, x86_64-pc-windows-msvc, beta)	39s
test (windows-latest, x86_64-pc-windows-gnu, stable)	40s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	16s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.85.0)	13s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	15s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	34s
test-ios	17s
	5m 24s

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