Tests

Mutate == to != and vice versa #1132

Job	Run time
cargo-mutants	1h 16m 52s
build (macOS-latest, stable)	3m 4s
build (macOS-latest, nightly)	5m 15s
build (macOS-latest, 1.70)	3m 38s
build (ubuntu-latest, stable)	1m 24s
build (ubuntu-latest, nightly)	1m 20s
incremental-mutants	14m 42s
build (ubuntu-latest, 1.70)	1m 49s
build (windows-latest, stable)	3m 7s
build (windows-latest, nightly)	2m 39s
build (windows-latest, 1.70)	2m 27s
	1h 56m 17s

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