Add tests for when '-' is used to signify to use standard input #28

Job	Run time
cargo fmt --all -- --check	13s
cargo check (ubuntu-latest)	16s
Code Coverage (ubuntu-latest, unix)	2m 11s
cargo check (macOS-latest)	25s
cargo clippy -- -D warnings (ubuntu-latest)	21s
Code Coverage (macos-latest, macos)	4m 0s
cargo check (windows-latest)	42s
GNU test suite	35s
cargo clippy -- -D warnings (macOS-latest)	27s
Code Coverage (windows-latest, windows)	1m 8s
cargo clippy -- -D warnings (windows-latest)	45s
cargo test (ubuntu-latest)	51s
cargo test (macOS-latest)	4m 55s
cargo test (windows-latest)	56s
	17m 45s

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