Clean up integration tests #370

Job	Run time
cargo-deny (advisories)	22s
lint	42s
cargo-deny (bans licenses sources)	18s
aarch64-apple-darwin / build	53s
aarch64-apple-ios / build	1m 4s
aarch64-apple-darwin-nightly / build	54s
aarch64-unknown-linux-gnu / build	43s
aarch64-unknown-linux-musl / build	1m 13s
arm-linux-androideabi / build	34s
armv7-linux-androideabi / build	39s
i686-pc-windows-gnu / build	2m 51s
i686-pc-windows-msvc / build	2m 33s
i686-unknown-linux-gnu / build	44s
i686-unknown-linux-musl / build	1m 27s
msrv-aarch64-apple-darwin / build	2m 29s
msrv-arm-linux-androideabi / build	2m 21s
msrv-x86_64-pc-windows-msvc / build	3m 29s
msrv-x86_64-unknown-freebsd / build	2m 18s
msrv-x86_64-unknown-linux-gnu / build	2m 23s
msrv-x86_64-unknown-linux-musl / build	2m 27s
msrv-x86_64-unknown-netbsd / build	2m 19s
x86_64-apple-darwin / build	39s
x86_64-pc-windows-gnu / build	2m 50s
x86_64-pc-windows-msvc / build	2m 45s
x86_64-pc-windows-msvc-nightly / build	2m 30s
x86_64-unknown-freebsd / build	28s
x86_64-unknown-linux-gnu / build	49s
x86_64-unknown-linux-gnu-nightly / build	1m 21s
x86_64-unknown-linux-musl / build	56s
x86_64-unknown-netbsd / build	25s
	45m 26s

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