Upstream test suite: correctly handle tests that are skipped (fixes #92) #300

Job	Run time
cargo fmt --all -- --check	10s
cargo check (ubuntu-latest)	12s
cargo test (ubuntu-latest)	38s
cargo check (macOS-latest)	11s
cargo test (macOS-latest)	3m 4s
cargo check (windows-latest)	32s
cargo clippy -- -D warnings (ubuntu-latest)	9s
cargo test (windows-latest)	4m 8s
cargo clippy -- -D warnings (macOS-latest)	12s
cargo clippy -- -D warnings (windows-latest)	1m 30s
Code Coverage (ubuntu-latest, unix)	1m 57s
GNU test suite	24s
Code Coverage (macos-latest, macos)	2m 7s
Code Coverage (windows-latest, windows)	5m 38s
	20m 52s

Provide feedback