Tests

refactor: Cleaner separation of OS-specific code #1688

Job	Run time
quick-test	2m 39s
tests-from-tarball (ubuntu-latest)	2m 18s
test (macOS-latest, stable)	5m 37s
pr-mutants (cargo)	6m 30s
test (macOS-latest, nightly)	9m 18s
cargo-mutants (0, cargo)	11m 23s
pr-mutants (nextest)	7m 2s
test (macOS-latest, 1.74)	7m 29s
cargo-mutants (1, cargo)	9m 40s
test (ubuntu-latest, stable)	6m 12s
cargo-mutants (2, cargo)	13m 13s
test (ubuntu-latest, nightly)	8m 21s
cargo-mutants (3, cargo)	9m 18s
test (ubuntu-latest, 1.74)	6m 53s
cargo-mutants (4, cargo)	17m 26s
test (windows-latest, stable)	10m 41s
cargo-mutants (5, cargo)	12m 14s
test (windows-latest, nightly)	16m 29s
cargo-mutants (6, cargo)	10m 3s
test (windows-latest, 1.74)	10m 24s
cargo-mutants (7, cargo)	6m 56s
cargo-mutants (8, cargo)	9m 29s
cargo-mutants (9, cargo)	9m 0s
overall-result	1s
	3h 28m 36s

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