Function rewrite_with_line_ending

core/tests/testutils/mod.rs:460–469

Rewrites `path` file with to use `line_ending`. This is "inefficient" (not that it matters in this specific scenario) but it helps keep `generate()` simple _and_ it also allows us to validate CRLF behavior outside of Windows.

(path: &Path, line_ending: &str)

/// This is "inefficient" (not that it matters in this specific scenario) but it helps keep
/// `generate()` simple _and_ it also allows us to validate CRLF behavior outside of Windows.
fn rewrite_with_line_ending(path: &Path, line_ending: &str) -> io::Result<()> {
    if line_ending == "\n" {
        return Ok(());
    }

    let text = fs::read_to_string(path)?;
    let normalized = text.replace("\r\n", "\n");
    let rewritten = normalized.replace('\n', line_ending);
    fs::write(path, rewritten)
}

#[test]
fn test_rewrite_with_line_ending() -> io::Result<()> {