Tests

Mutate == to != and vice versa #1130

Job	Run time
incremental-mutants	13m 48s
cargo-mutants	1h 16m 26s
build (macOS-latest, stable)	2m 23s
build (macOS-latest, nightly)	3m 33s
build (macOS-latest, 1.70)	3m 9s
build (ubuntu-latest, stable)	1m 24s
build (ubuntu-latest, nightly)	1m 23s
build (ubuntu-latest, 1.70)	1m 42s
build (windows-latest, stable)	2m 48s
build (windows-latest, nightly)	2m 20s
build (windows-latest, 1.70)	2m 22s
	1h 51m 18s

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