Add regression test for watertightness (#698) #1636

Job	Run time
cargo check (msrv) (wasm32)	49s
cargo check (msrv) (windows-latest)	1m 58s
cargo check (aarch64-android)	31s
cargo check (msrv) (macos-latest)	59s
cargo clippy (windows-latest)	2m 26s
cargo clippy (wasm32)	1m 20s
cargo check (msrv) (ubuntu-latest)	46s
cargo doc	1m 20s
cargo clippy (macos-latest)	1m 0s
cargo clippy (ubuntu-latest)	1m 35s
cargo fmt	34s
cargo test (wasm32)	28s
Prime LFS Cache	8s
typos	9s
cargo test (windows-latest)	1m 45s
cargo test (macos-latest)	1m 10s
cargo test (ubuntu-latest)	3m 2s
	20m 0s

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