Tests

Incremental runs #1147

Job	Run time
incremental-mutants	14m 29s
cargo-mutants	1h 24m 10s
build (macOS-latest, stable)	3m 59s
build (macOS-latest, nightly)	2m 57s
build (macOS-latest, 1.70)	2m 29s
build (ubuntu-latest, stable)	1m 47s
build (ubuntu-latest, nightly)	1m 33s
build (ubuntu-latest, 1.70)	1m 46s
build (windows-latest, stable)	3m 35s
build (windows-latest, nightly)	2m 41s
build (windows-latest, 1.70)	3m 0s
	2h 2m 26s

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