TUI Test

TUI Test is a framework for testing terminal applications. It provides a rich API for writing tests that interact with a terminal application across macOS, Linux, and Windows with a wide range of shells. It is built to be fast, reliable, and easy to use.

Requirements

• Node.js 20.X, 18.X, 16.X (16.6.0 >=)

Installation

Install TUI Test as using npm:

npm i -D @microsoft/tui-test

or yarn

yarn add --dev @microsoft/tui-test

or pnpm

pnpm add -D @microsoft/tui-test

Running Tests

Running tests is as simple as running TUI Test from the command line after installation:

npx @microsoft/tui-test

Capabilities

Resilient • No flaky tests

Auto-wait TUI Test provides a rich API for interacting with the terminal. It waits for the terminal to be ready before executing commands, and it provides tooling for waiting for terminal renders before executing assertions.

Tracing. Configure test retry strategy, capture stdout & stderr, and create detailed terminal snapshots to eliminate flakes.

Full isolation • Fast execution

Terminal contexts. TUI Test creates a new 'terminal context' for each test, which includes a new terminal and new underlying pty. This delivers full test isolation with zero overhead. Creating new terminal contexts only takes a handful of milliseconds.

Multi-platform / Multi-shell • No more "it works in my shell"

Multi-platform. TUI Test supports testing on macOS, Linux, and Windows with a wide range of shells when installed: cmd, windows powershell, powershell, bash, git-bash, fish, zsh, and xonsh.

Wide-support. TUI Test uses xterm.js to render the terminal, which is a widely used terminal emulator in projects like VSCode and Hyper.

Examples

To find more TUI Test examples check out the examples folder or in TUI Test's e2e tests.

Terminal Program

This code snippet shows how to start the terminal with a specific program running.

import { test, expect } from "@microsoft/tui-test";

test.use({ program: { file: "git" } });

test("git shows usage message", async ({ terminal }) => {
  await expect(terminal.getByText("usage: git", { full: true })).toBeVisible();
});

Terminal Screenshot

This code snippet shows how to take a screenshot of the terminal.

import { test, expect } from "@microsoft/tui-test";

test("take a screenshot", async ({ terminal }) => {
  terminal.write("foo")

  await expect(terminal.getByText("foo")).toBeVisible();
  await expect(terminal).toMatchSnapshot();
});

Terminal Assertions

This code snippet shows how to use rich assertions of the terminal.

import { test, expect } from "@microsoft/tui-test";

test("make a regex assertion", async ({ terminal }) => {
  terminal.submit("ls -l")

  await expect(terminal.getByText(/total [0-9]{3}/g)).toBeVisible();
});

Traces

TUI Test provides a rich tracing system to help you debug and diagnose issues with your tests. You can enable traces by setting the trace value in your tui-test.config.ts to true or by running the cli with the -t/--trace flag.

Traces are contain a replay of everything the terminal received and can be used to diagnose issues with your tests, especially when issues happen on different machines. Traces are stored in by default in the tui-traces folder in the root of your project and can be replayed via the show-trace command.

Configuration

TUI Test can be configured via the tui-test.config.[ts|js] file in the root of your project. The following is an example of a configuration file:

import { defineConfig } from "@microsoft/tui-test";

export default defineConfig({
  retries: 3,
  trace: true
});

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.

Trademarks

This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.