Add test for read returning available data before timeout #415

Job	Run time
cargo-deny (advisories)	20s
lint	1m 24s
cargo-deny (bans licenses sources)	30s
aarch64-apple-darwin-nightly / build	53s
aarch64-apple-darwin / build	51s
aarch64-apple-ios / build	42s
aarch64-unknown-linux-gnu / build	2m 23s
aarch64-unknown-linux-musl / build	2m 45s
arm-linux-androideabi / build	1m 46s
armv7-linux-androideabi / build	35s
i686-pc-windows-gnu / build	2m 11s
i686-pc-windows-msvc / build	3m 2s
i686-unknown-linux-gnu / build	1m 46s
i686-unknown-linux-musl / build	1m 33s
msrv-aarch64-apple-darwin / build	2m 8s
msrv-arm-linux-androideabi / build	2m 12s
msrv-x86_64-pc-windows-msvc / build	3m 12s
msrv-x86_64-unknown-freebsd / build	2m 6s
msrv-x86_64-unknown-linux-gnu / build	2m 7s
msrv-x86_64-unknown-linux-musl / build	2m 10s
msrv-x86_64-unknown-netbsd / build	2m 36s
x86_64-apple-darwin / build	39s
x86_64-pc-windows-gnu / build	2m 34s
x86_64-pc-windows-msvc / build	2m 48s
x86_64-unknown-freebsd / build	1m 0s
x86_64-pc-windows-msvc-nightly / build	2m 21s
x86_64-unknown-linux-gnu / build	46s
x86_64-unknown-linux-gnu-nightly / build	56s
x86_64-unknown-netbsd / build	1m 35s
x86_64-unknown-linux-musl / build	2m 1s
	51m 52s

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