in src/main.rs [1097:1105]
fn test_empty_contents() {
let dir = create_test_files(&[("foo.txt", "foo")]);
Command::cargo_bin("fastmod")
.unwrap()
.args(&["foo", "baz", "--dir", dir.path().to_str().unwrap()])
.write_stdin("n\n")
.assert()
.success();
}