Tests

Mutate == to != and vice versa #1131

Job	Run time
cargo-mutants	1h 14m 2s
incremental-mutants	14m 17s
build (macOS-latest, stable)	3m 7s
build (macOS-latest, nightly)	3m 1s
build (macOS-latest, 1.70)	3m 52s
build (ubuntu-latest, stable)	1m 30s
build (ubuntu-latest, nightly)	1m 19s
build (ubuntu-latest, 1.70)	1m 42s
build (windows-latest, stable)	2m 46s
build (windows-latest, nightly)	2m 49s
build (windows-latest, 1.70)	2m 49s
	1h 51m 14s

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