When running `cargo test` the following tests fail if [ed](https://www.gnu.org/software/ed/ed.html) is not installed: * ed_diff::tests::test_permutations * ed_diff::tests::test_permutations_empty_lines * ed_diff::tests::test_permutations_reverse They fail because they call `Command::new("ed")`.
When running
cargo testthe following tests fail if ed is not installed:They fail because they call
Command::new("ed").