Tests

Mutate == to != and vice versa #1140

Job	Run time
cargo-mutants	1h 14m 21s
incremental-mutants	16m 26s
build (macOS-latest, stable)	2m 11s
build (macOS-latest, nightly)	4m 49s
build (macOS-latest, 1.70)	3m 4s
build (ubuntu-latest, stable)	2m 5s
build (ubuntu-latest, nightly)	1m 54s
build (ubuntu-latest, 1.70)	1m 46s
build (windows-latest, stable)	3m 10s
build (windows-latest, nightly)	3m 50s
build (windows-latest, 1.70)	2m 26s
	1h 56m 2s

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