testty

Documentation | API reference

testty is a framework for end-to-end testing of terminal apps. It launches your real app and checks what shows up on screen — text, colors, and highlights — with a single Rust API.

Installation

[dev-dependencies]
testty = "0.9"
tempfile = "3"

Capabilities

Reliable • No flaky tests

• Auto-wait. wait_for_stable_frame and eventually wait for the screen to settle before asserting, so you never hard-code sleeps.
• Screen-first assertions. Check visible text, colors, and highlighted items, with ready-made helpers for tabs, dialogs, and footers.
• Full isolation. Each test runs your real binary in its own workspace, so tests never bleed into one another.

Proof you can share

• Snapshots. Compare a run against a saved baseline — screen text or pixels.
• Reports. Save what each test saw as plain text, a screenshot, an animated GIF, or a self-contained HTML report.

Examples

Write a test

use testty::prelude::*;

#[test]
fn tab_switches_view() {
    let temp = tempfile::TempDir::new().unwrap();
    let builder = PtySessionBuilder::new(env!("CARGO_BIN_EXE_myapp"))
        .size(80, 24)
        .workdir(temp.path());

    let scenario = Scenario::new("tab_switch")
        .wait_for_stable_frame(500, 5_000)
        .press_key("Tab")
        .wait_for_stable_frame(300, 3_000)
        .capture();

    let frame = scenario.run(builder).expect("scenario failed");

    testty::recipe::expect_selected_tab(&frame, "Sessions");
    testty::recipe::expect_unselected_tab(&frame, "Projects");
}

cargo test -p my-app --test e2e

Wait for something to appear

use std::time::Duration;
use testty::prelude::*;

let scenario = Scenario::new("counter")
    .write_text("+++")
    .eventually(
        Duration::from_secs(5),
        Duration::from_millis(50),
        |frame| assertion::match_text_in_region(frame, "Counter: 3", &Region::full(80, 24)),
    )
    .capture();

Compare against a saved baseline

use testty::snapshot::{self, SnapshotConfig};

let config = SnapshotConfig::new("tests/baselines", "tests/artifacts");
snapshot::assert_frame_snapshot_matches(&config, "startup", &frame.all_text())
    .expect("snapshot should match");

Save a shareable report

use std::path::Path;
use testty::prelude::*;
use testty::proof::html::HtmlBackend;

let (_frame, report) = scenario.run_with_proof(builder).expect("failed");
report.save(&HtmlBackend, Path::new("proof.html")).unwrap();

Resources

• Getting started — install, write your first test, run it
• Scenarios — describe a sequence of actions and waits
• Assertions — check text, colors, and highlights on screen
• Snapshots — compare a test against a saved baseline
• Proof pipeline — save what a test saw as text, image, GIF, or HTML
• Journeys — reusable building blocks for tests
• Frame diffing — see what changed between two screens
• Examples — runnable example programs
• Upgrading — version migration notes
• API reference — full generated docs

License

Apache-2.0. See LICENSE.