Tests

refactor: Cleaner separation of OS-specific code #1687

Job	Run time
quick-test	2m 29s
tests-from-tarball (ubuntu-latest)	2m 18s
test (macOS-latest, stable)	5m 43s
pr-mutants (cargo)	8m 13s
test (macOS-latest, nightly)	9m 41s
cargo-mutants (0, cargo)	11m 46s
test (macOS-latest, 1.74)	6m 36s
pr-mutants (nextest)	7m 8s
cargo-mutants (1, cargo)	9m 43s
test (ubuntu-latest, stable)	6m 26s
cargo-mutants (2, cargo)	13m 36s
cargo-mutants (3, cargo)	9m 39s
test (ubuntu-latest, nightly)	8m 41s
cargo-mutants (4, cargo)	17m 43s
cargo-mutants (5, cargo)	12m 44s
test (ubuntu-latest, 1.74)	6m 44s
cargo-mutants (6, cargo)	10m 27s
cargo-mutants (7, cargo)	7m 27s
test (windows-latest, stable)	11m 3s
cargo-mutants (8, cargo)	9m 38s
test (windows-latest, nightly)	17m 1s
cargo-mutants (9, cargo)	8m 53s
test (windows-latest, 1.74)	10m 5s
overall-result	1s
	3h 33m 45s

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