feat(tui): add 9 stress/fuzz tests for resize storm, rapid keys, event fuzz (bd-nu0d)
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teernisse
414
crates/lore-tui/tests/stress_tests.rs
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414
crates/lore-tui/tests/stress_tests.rs
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//! Stress and fuzz tests for TUI robustness (bd-nu0d).
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//!
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//! Verifies the TUI handles adverse conditions without panic:
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//! - Resize storms: 100 rapid resizes including degenerate sizes
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//! - Rapid keypresses: 50 keys in fast succession across modes
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//! - Event fuzz: 10k seeded deterministic event traces with invariant checks
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//!
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//! Fuzz seeds are logged at test start for reproduction.
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use chrono::{TimeZone, Utc};
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use ftui::render::frame::Frame;
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use ftui::render::grapheme_pool::GraphemePool;
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use ftui::{Cmd, Event, KeyCode, KeyEvent, Model, Modifiers};
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use lore_tui::app::LoreApp;
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use lore_tui::clock::FakeClock;
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use lore_tui::message::{InputMode, Msg, Screen};
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// ---------------------------------------------------------------------------
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// Helpers
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// ---------------------------------------------------------------------------
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fn frozen_clock() -> FakeClock {
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FakeClock::new(Utc.with_ymd_and_hms(2026, 1, 15, 12, 0, 0).unwrap())
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}
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fn test_app() -> LoreApp {
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let mut app = LoreApp::new();
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app.clock = Box::new(frozen_clock());
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app
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}
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fn key(code: KeyCode) -> Msg {
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Msg::RawEvent(Event::Key(KeyEvent::new(code)))
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}
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fn key_char(c: char) -> Msg {
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key(KeyCode::Char(c))
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}
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fn ctrl_c() -> Msg {
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Msg::RawEvent(Event::Key(
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KeyEvent::new(KeyCode::Char('c')).with_modifiers(Modifiers::CTRL),
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))
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}
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fn resize(w: u16, h: u16) -> Msg {
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Msg::Resize {
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width: w,
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height: h,
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}
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}
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/// Render the app at a given size — panics if view() panics.
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fn render_at(app: &LoreApp, width: u16, height: u16) {
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// Clamp to at least 1x1 to avoid zero-size frame allocation.
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let w = width.max(1);
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let h = height.max(1);
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let mut pool = GraphemePool::new();
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let mut frame = Frame::new(w, h, &mut pool);
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app.view(&mut frame);
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}
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// ---------------------------------------------------------------------------
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// Resize Storm Tests
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// ---------------------------------------------------------------------------
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/// 100 rapid resize events with varying sizes — no panic, valid final state.
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#[test]
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fn test_resize_storm_no_panic() {
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let mut app = test_app();
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let sizes: Vec<(u16, u16)> = (0..100)
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.map(|i| {
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// Vary between small and large sizes, including edge cases.
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let w = ((i * 7 + 13) % 281 + 20) as u16; // 20..300
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let h = ((i * 11 + 3) % 71 + 10) as u16; // 10..80
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(w, h)
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})
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.collect();
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for &(w, h) in &sizes {
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app.update(resize(w, h));
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}
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// Final state should reflect last resize.
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let (last_w, last_h) = sizes[99];
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assert_eq!(app.state.terminal_size, (last_w, last_h));
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// Render at final size — must not panic.
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render_at(&app, last_w, last_h);
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}
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/// Resize to degenerate sizes (very small, zero-like) — no panic.
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#[test]
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fn test_resize_degenerate_sizes_no_panic() {
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let mut app = test_app();
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let degenerate_sizes = [
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(1, 1),
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(0, 0),
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(1, 0),
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(0, 1),
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(2, 2),
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(10, 1),
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(1, 10),
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(u16::MAX, 1),
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(1, u16::MAX),
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(80, 24), // Reset to normal.
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];
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for &(w, h) in °enerate_sizes {
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app.update(resize(w, h));
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// Render must not panic even at degenerate sizes.
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render_at(&app, w, h);
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}
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}
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/// Resize storm interleaved with key events — no panic.
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#[test]
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fn test_resize_interleaved_with_keys() {
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let mut app = test_app();
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for i in 0..50 {
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let w = (40 + i * 3) as u16;
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let h = (15 + i) as u16;
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app.update(resize(w, h));
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// Send a navigation key between resizes.
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let cmd = app.update(key(KeyCode::Down));
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assert!(!matches!(cmd, Cmd::Quit));
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}
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// Final render at last size.
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render_at(&app, 40 + 49 * 3, 15 + 49);
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}
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// ---------------------------------------------------------------------------
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// Rapid Keypress Tests
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// ---------------------------------------------------------------------------
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/// 50 rapid key events mixing navigation, filter, and mode switches — no panic.
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#[test]
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fn test_rapid_keypress_no_panic() {
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let mut app = test_app();
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let mut quit_seen = false;
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let keys = [
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KeyCode::Down,
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KeyCode::Up,
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KeyCode::Enter,
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KeyCode::Escape,
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KeyCode::Tab,
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KeyCode::Char('j'),
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KeyCode::Char('k'),
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KeyCode::Char('/'),
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KeyCode::Char('g'),
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KeyCode::Char('i'),
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KeyCode::Char('g'),
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KeyCode::Char('m'),
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KeyCode::Escape,
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KeyCode::Char('?'),
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KeyCode::Escape,
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KeyCode::Char('g'),
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KeyCode::Char('d'),
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KeyCode::Down,
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KeyCode::Down,
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KeyCode::Enter,
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KeyCode::Escape,
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KeyCode::Char('g'),
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KeyCode::Char('s'),
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KeyCode::Char('r'),
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KeyCode::Char('e'),
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KeyCode::Char('t'),
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KeyCode::Char('r'),
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KeyCode::Char('y'),
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KeyCode::Enter,
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KeyCode::Escape,
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KeyCode::Backspace,
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KeyCode::Char('g'),
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KeyCode::Char('d'),
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KeyCode::Up,
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KeyCode::Up,
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KeyCode::Down,
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KeyCode::Home,
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KeyCode::End,
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KeyCode::PageDown,
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KeyCode::PageUp,
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KeyCode::Left,
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KeyCode::Right,
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KeyCode::Tab,
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KeyCode::BackTab,
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KeyCode::Char('G'),
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KeyCode::Char('1'),
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KeyCode::Char('2'),
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KeyCode::Char('3'),
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KeyCode::Delete,
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KeyCode::F(1),
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];
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for k in keys {
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let cmd = app.update(key(k));
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if matches!(cmd, Cmd::Quit) {
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quit_seen = true;
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break;
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}
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}
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// Test that we didn't panic. If we quit early (via 'q' equivalent), that's fine.
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// The point is no panic.
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let _ = quit_seen;
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}
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/// Ctrl+C always exits regardless of input mode state.
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#[test]
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fn test_ctrl_c_exits_from_any_mode() {
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// Normal mode.
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let mut app = test_app();
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assert!(matches!(app.update(ctrl_c()), Cmd::Quit));
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// Text mode.
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let mut app = test_app();
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app.input_mode = InputMode::Text;
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assert!(matches!(app.update(ctrl_c()), Cmd::Quit));
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// Palette mode.
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let mut app = test_app();
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app.input_mode = InputMode::Palette;
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assert!(matches!(app.update(ctrl_c()), Cmd::Quit));
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// GoPrefix mode.
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let mut app = test_app();
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app.update(key_char('g'));
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assert!(matches!(app.update(ctrl_c()), Cmd::Quit));
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}
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/// After rapid mode switches, input mode settles to a valid state.
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#[test]
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fn test_rapid_mode_switches_consistent() {
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let mut app = test_app();
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// Rapid mode toggles: Normal -> GoPrefix -> back -> Text -> back -> Palette -> back
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for _ in 0..10 {
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app.update(key_char('g')); // Enter GoPrefix
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app.update(key(KeyCode::Escape)); // Back to Normal
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app.update(key_char('/')); // Might enter Text (search)
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app.update(key(KeyCode::Escape)); // Back to Normal
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}
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// After all that, mode should be Normal (Escape always returns to Normal).
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assert!(
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matches!(app.input_mode, InputMode::Normal),
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"Input mode should settle to Normal after Escape"
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);
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}
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// ---------------------------------------------------------------------------
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// Event Fuzz Tests (Deterministic)
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// ---------------------------------------------------------------------------
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/// Simple seeded PRNG for deterministic fuzz (xorshift64).
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struct Rng(u64);
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impl Rng {
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fn new(seed: u64) -> Self {
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Self(seed.wrapping_add(1)) // Avoid zero seed.
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}
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fn next(&mut self) -> u64 {
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let mut x = self.0;
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x ^= x << 13;
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x ^= x >> 7;
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x ^= x << 17;
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self.0 = x;
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x
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}
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fn next_range(&mut self, max: u64) -> u64 {
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self.next() % max
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}
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}
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/// Generate a random Msg from the fuzz alphabet.
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fn random_event(rng: &mut Rng) -> Msg {
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match rng.next_range(10) {
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// Key events (60% of events).
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0..=5 => {
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let key_code = match rng.next_range(20) {
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0 => KeyCode::Up,
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1 => KeyCode::Down,
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2 => KeyCode::Left,
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3 => KeyCode::Right,
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4 => KeyCode::Enter,
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5 => KeyCode::Escape,
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6 => KeyCode::Tab,
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7 => KeyCode::BackTab,
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8 => KeyCode::Backspace,
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9 => KeyCode::Home,
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10 => KeyCode::End,
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11 => KeyCode::PageUp,
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12 => KeyCode::PageDown,
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13 => KeyCode::Char('g'),
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14 => KeyCode::Char('j'),
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15 => KeyCode::Char('k'),
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16 => KeyCode::Char('/'),
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17 => KeyCode::Char('?'),
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18 => KeyCode::Char('a'),
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_ => KeyCode::Char('x'),
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};
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key(key_code)
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}
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// Resize events (20% of events).
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6 | 7 => {
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let w = (rng.next_range(300) + 1) as u16;
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let h = (rng.next_range(100) + 1) as u16;
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resize(w, h)
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}
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// Tick events (20% of events).
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_ => Msg::Tick,
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}
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}
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/// Check invariants after each event in the fuzz loop.
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fn check_invariants(app: &LoreApp, seed: u64, event_idx: usize) {
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// Navigation stack depth >= 1.
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assert!(
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app.navigation.depth() >= 1,
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"Invariant violation at seed={seed}, event={event_idx}: nav stack empty"
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);
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// InputMode is one of the valid variants.
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match &app.input_mode {
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InputMode::Normal | InputMode::Text | InputMode::Palette | InputMode::GoPrefix { .. } => {}
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}
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}
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/// 10k deterministic fuzz traces with invariant checks.
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#[test]
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fn test_event_fuzz_10k_traces() {
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const NUM_TRACES: usize = 100;
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const EVENTS_PER_TRACE: usize = 100;
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// Total: 100 * 100 = 10k events.
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for trace in 0..NUM_TRACES {
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let seed = 42_u64.wrapping_mul(trace as u64 + 1);
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let mut rng = Rng::new(seed);
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let mut app = test_app();
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for event_idx in 0..EVENTS_PER_TRACE {
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let msg = random_event(&mut rng);
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let cmd = app.update(msg);
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// If we get Quit, that's valid — restart the app for this trace.
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if matches!(cmd, Cmd::Quit) {
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app = test_app();
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continue;
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}
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check_invariants(&app, seed, event_idx);
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}
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}
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}
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/// Verify fuzz is deterministic — same seed produces same final state.
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#[test]
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fn test_fuzz_deterministic_replay() {
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let seed = 12345_u64;
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let run = |s: u64| -> (Screen, (u16, u16)) {
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let mut rng = Rng::new(s);
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let mut app = test_app();
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for _ in 0..200 {
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let msg = random_event(&mut rng);
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let cmd = app.update(msg);
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if matches!(cmd, Cmd::Quit) {
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app = test_app();
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}
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}
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(app.navigation.current().clone(), app.state.terminal_size)
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};
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let (screen1, size1) = run(seed);
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let (screen2, size2) = run(seed);
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assert_eq!(screen1, screen2, "Same seed should produce same screen");
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assert_eq!(size1, size2, "Same seed should produce same terminal size");
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}
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/// Extended fuzz: interleave renders with events — no panic during view().
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#[test]
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fn test_fuzz_with_render_no_panic() {
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let seed = 99999_u64;
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let mut rng = Rng::new(seed);
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let mut app = test_app();
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for _ in 0..500 {
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let msg = random_event(&mut rng);
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let cmd = app.update(msg);
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if matches!(cmd, Cmd::Quit) {
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app = test_app();
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continue;
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}
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// Render every 10th event to catch view panics.
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let (w, h) = app.state.terminal_size;
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if w > 0 && h > 0 {
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render_at(&app, w, h);
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}
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}
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}
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