use crate::test_backend::VT100Backend;use ratatui::layout::Rect;use ratatui::text::Line;#[test]fn live_001_commit_on_overflow() {    let backend = VT100Backend::new(/*width*/ 20, /*height*/ 6);    let mut term =        codex_tui::Terminal::with_options(backend).expect("terminal should be constructed");    let area = Rect::new(        /*x*/ 0, /*y*/ 5, /*width*/ 20, /*height*/ 1,    );    term.set_viewport_area(area);    // Build 5 explicit rows at width 20.    let mut rb = codex_tui::RowBuilder::new(/*target_width*/ 20);    rb.push_fragment("one\n");    rb.push_fragment("two\n");    rb.push_fragment("three\n");    rb.push_fragment("four\n");    rb.push_fragment("five\n");    // Keep the last 3 in the live ring; commit the first 2.    let commit_rows = rb.drain_commit_ready(/*max_keep*/ 3);    let lines: Vec<Line<'static>> = commit_rows.into_iter().map(|r| r.text.into()).collect();    codex_tui::insert_history_lines(&mut term, lines)        .expect("Failed to insert history lines in test");    let screen = term.backend().vt100().screen();    // The words "one" and "two" should appear above the viewport.    let joined = screen.contents();    assert!(        joined.contains("one"),        "expected committed 'one' to be visible\n{joined}"    );    assert!(        joined.contains("two"),        "expected committed 'two' to be visible\n{joined}"    );    // The last three (three,four,five) remain in the live ring, not committed here.}