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Testem

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What Testem is

Testem is a free, MIT-licensed JavaScript test runner for running tests in Node, real desktop browsers, or a configured launcher. It supports Jasmine, QUnit, Mocha, and custom framework adapters, and can be used for unit, integration, end-to-end-style, or custom test setups. Browser runs can use Chrome, Firefox, Safari, or Edge; a Headless Chrome launcher is also available. Development mode provides a terminal interface and watches project files to rerun tests after relevant changes. CI mode runs tests in available browsers and can run multiple browsers in parallel. Testem includes TAP, dot, xunit, and TeamCity reporters, with support for custom reporters, and its listed preprocessing options include Babel, TypeScript, Browserify, ESLint, JSHint, JSLint, and CoffeeScript. It also offers coverage reporting and a programmatic API with startDev, startCI, and startServer modes. The tool is available for Windows, macOS, and Linux. It requires a supported Node.js runtime: ^22.17.0, ^24.0.0, or >=26.0.0.

Who it suits

Testem suits JavaScript developers who need browser- or Node-based test runs for development or CI workflows. Its framework adapters, reporters, and programmatic API also suit teams with varied test setups.

What it does well

  • Supports Jasmine, QUnit, Mocha, and custom adapters.
  • Can launch Chrome, Firefox, Safari, and Edge.
  • CI mode supports parallel browser runs.
  • Includes coverage reporting and multiple CI reporters.
  • Free and MIT licensed.

What to know first

  • Requires a supported Node.js runtime.
  • Listed Node.js versions start at ^22.17.0.
  • No free trial is listed.

Plans

PlanBilled and limitsPrice
TestemOpen-source JavaScript test runner · MIT licenseFree

As github.com lists them, read 7 Oct 2026. The maker's own page has the final word.

Getting started

  1. Open the Testem project website on GitHub.
  2. Install or select a supported Node.js runtime.
  3. Choose a supported framework or configure a custom adapter.
  4. Set up the browser or launcher for the tests you want to run.
  5. Use development mode or configure a CI workflow.

Verdict

Testem covers development and CI testing across Node and desktop browsers, with support for multiple frameworks, reporters, and preprocessing tools. Check that the required Node.js runtime fits your environment before adopting it.

Questions

How much does Testem cost?

Testem is free and open source. Its listed plan is free.

Which platforms does Testem support?

Testem is available for Linux, macOS, and Windows.

Which test frameworks and runtimes does it support?

It supports Jasmine, QUnit, Mocha, and custom adapters. Supported runtimes include Node.js, Chrome, Firefox, Safari, and Edge.

What Node.js version does Testem require?

It requires Node.js ^22.17.0, ^24.0.0, or >=26.0.0.

Facts from Testem's own pages

Browser testing
It can launch real browsers, including Chrome, Firefox, Safari, and Edge, and provides a Headless Chrome launcher. · github.com, 4 Oct 2026
CI integrations
The README describes use with GitHub Actions and other CI systems, including Jenkins and TeamCity. · github.com, 4 Oct 2026
CI workflow
CI mode runs tests in available browsers and can run multiple browsers in parallel. · github.com, 7 Oct 2026
Development workflow
Development mode provides a terminal interface and watches project files to rerun tests after relevant changes. · github.com, 7 Oct 2026
Frameworks
It includes support for Jasmine, QUnit, and Mocha, with custom adapters for other frameworks. · github.com, 7 Oct 2026
Installation requirement
Testem requires a supported Node.js runtime; the README lists ^22.17.0, ^24.0.0, or >=26.0.0. · github.com, 7 Oct 2026
Integrations
The README describes use with GitHub Actions, Jenkins, and TeamCity. · github.com, 7 Oct 2026
License
The repository identifies the project as MIT licensed. · github.com, 7 Oct 2026
Platforms
The README lists macOS, Windows, and Linux cross-platform support. · github.com, 7 Oct 2026
Preprocessors
The README lists Babel, TypeScript, Browserify, ESLint, JSHint, JSLint, and CoffeeScript support. · github.com, 7 Oct 2026
Programmatic API
Testem exposes an API class with startDev, startCI, and startServer modes. · github.com, 4 Oct 2026
Purpose
Testem runs JavaScript tests in real desktop browsers, Node, Chrome, or a configured launcher. · github.com, 7 Oct 2026
Reporters
Built-in CI reporters include TAP, dot, xUnit, and TeamCity, and users can add a custom reporter. · github.com, 7 Oct 2026
Security
The repository page shows no security advisories. · github.com, 7 Oct 2026
Test styles
It supports unit, integration, end-to-end style, and custom test setups. · github.com, 7 Oct 2026
Workflows
It supports test-driven development and continuous integration workflows. · github.com, 4 Oct 2026

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