Tests

Replace `block` module with helper functions #72

Job	Run time
Check doc	15s
Check Clippy and rustfmt	17s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	17s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	35s
test (macos-latest, x86_64-apple-darwin, stable)	20s
test (windows-latest, x86_64-pc-windows-gnu, stable)	53s
test (windows-latest, x86_64-pc-windows-msvc, beta)	45s
test-no-std	15s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	35s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.85.0)	12s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	17s
test-miri	32s
test-ios	20s
	5m 33s

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