Tests

Don't need OpenOptions::write with append #1

Job	Run time
release-binary	1m 31s
build (macOS-latest, stable)	2m 42s
build (macOS-latest, nightly)	6m 45s
build (macOS-latest, 1.70)	7m 39s
build (ubuntu-latest, stable)	1m 51s
build (ubuntu-latest, nightly)	1m 51s
build (ubuntu-latest, 1.70)	2m 23s
build (windows-latest, stable)	3m 45s
build (windows-latest, nightly)	3m 13s
build (windows-latest, 1.70)	3m 8s
pr-mutants	0s
cargo-mutants	0s
	34m 48s

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