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Web Test Runner

No phone app

6.4No. 2 of 23
in JavaScript Testing Frameworks
  • Recognised40% of the score20
  • Phone app26% of the score0
  • Documented20% of the score100
  • Free plan14% of the score100
Free plan
Yes
Runs on
Linux, Mac, self-hosted, Web, Windows
Visit site Alternatives

Summary

Web Test Runner is a free, open-source test runner for web applications, installed as an npm development dependency. It runs tests in parallel and isolation, placing each test file in its own browser environment. The documented headless browser launchers include Puppeteer, Playwright, Selenium, BrowserStack, and WebdriverIO. Playwright supports Chromium, Firefox, and WebKit, while BrowserStack can run tests remotely, including against older browser versions. For debugging, the runner can open a real browser window with developer tools and report browser logs, 404 responses, and errors. Its command line includes interactive watch mode, which reruns tests when files change, and code coverage with configurable thresholds and reports. Default coverage instrumentation uses Chromium. Other capabilities include ES module mocking through import maps and Mocha integration, with guidance for creating a custom test framework. The project is powered by esbuild and Rollup plugins and is MIT-licensed. The documentation points to GitHub for help and feedback, and the project invites documentation contributions.

Who it is for

Web Test Runner suits developers testing web applications in browser environments. It may be useful to teams needing parallel, isolated runs, browser debugging, watch mode, or coverage reporting.

What is good

  • Runs test files in parallel and isolation.
  • Supports Chromium, Firefox, and WebKit through Playwright.
  • Includes watch mode and configurable coverage reports.
  • Supports ES module mocking with import maps.

What to know first

  • Default coverage instrumentation uses Chromium.
  • Remote testing requires a documented launcher such as BrowserStack.
  • Installation is as an npm development dependency.

Verdict

Web Test Runner offers browser-based execution, debugging, and coverage in an open-source package. Consider its npm setup and the default Chromium coverage instrumentation when assessing fit.

Web Test Runner plans and pricing

All plans
Open source Free MIT-licensed project · installable as an npm development dependency github.com · 3 Oct 2026

Compared on JavaScript testing frameworks

Free plan
Yesmodern-web.dev
Component testing
Yesmodern-web.dev
Coverage reporting
Yesmodern-web.dev
Snapshot testing
Yesmodern-web.dev
Supported runtimes
Chromium, Firefox, WebKitmodern-web.dev
Parallel execution
Yesmodern-web.dev

Facts

Purpose
Web Test Runner is a test runner for web applications.modern-web.dev · 2 Oct 2026
Browser testing
It can run tests in headless browsers using Puppeteer, Playwright, Selenium, or WebdriverIO.modern-web.dev · 2 Oct 2026
Parallel and isolated tests
Tests run in parallel and in isolation, with each test file in its own browser environment.modern-web.dev · 2 Oct 2026
Debugging
Debug mode opens a real browser window with developer tools, and the runner reports browser logs, 404s, and errors.modern-web.dev · 2 Oct 2026
Watch mode and coverage
The command line supports interactive watch mode and code coverage profiling.modern-web.dev · 2 Oct 2026
Module mocking
The runner can mock ES modules using import maps.modern-web.dev · 2 Oct 2026
Browser integrations
Playwright can run tests on Chromium, Firefox, and WebKit; BrowserStack and Sauce Labs launchers are also documented.modern-web.dev · 2 Oct 2026
Build tooling
The runner is powered by esbuild and Rollup plugins.modern-web.dev · 2 Oct 2026
Test framework
The documentation includes a Mocha test framework integration and instructions for writing a custom test framework.modern-web.dev · 2 Oct 2026
Installation
The project documents installation as an npm development dependency using @web/test-runner.modern-web.dev · 2 Oct 2026
Project status
Modern Web says its code is open source and publicly available on GitHub, with packages published under the @web npm namespace.modern-web.dev · 2 Oct 2026
Support and contributions
The site directs users to GitHub for help and feedback and invites contributions to its documentation.modern-web.dev · 2 Oct 2026
Maker focus
Modern Web says its goal is to provide developers with guides and tools for building for the modern web while working closely with browser capabilities.modern-web.dev · 2 Oct 2026
Browser diagnostics
It reports browser logs, 404 responses, and errors.modern-web.dev · 3 Oct 2026
Execution
Tests run in parallel and isolation, and watch mode reruns tests when files change.modern-web.dev · 3 Oct 2026
Browser launchers
Documented launchers include Puppeteer, Playwright, Selenium, BrowserStack, and WebdriverIO.modern-web.dev · 3 Oct 2026
Browser coverage
The Playwright launcher supports bundled Chromium, Firefox, and WebKit browsers.modern-web.dev · 3 Oct 2026
Remote testing
The BrowserStack launcher runs tests remotely, and the docs say it can be useful for older browser versions.modern-web.dev · 3 Oct 2026
Code coverage
Coverage supports configurable thresholds and reports, while the default coverage instrumentation uses Chromium.modern-web.dev · 3 Oct 2026
Integrations
The docs describe using the Playwright launcher with GitHub Actions via Microsoft's Playwright Action.modern-web.dev · 3 Oct 2026
License
The project's GitHub page identifies the repository license as MIT.github.com · 3 Oct 2026
Support
The project links to Discord for community discussion and lists sponsorship and contributions as ways to support it.github.com · 3 Oct 2026
Maker
Modern Web describes its goal as providing developers with guides and tools for modern web development while working closely with the browser.modern-web.dev · 3 Oct 2026

Best Web Test Runner alternatives

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Karma No. 1 7.8 iPhone + AndroidFreePoku No. 3 6.3 No phone appFreeRstest No. 4 6.3 No phone appFreeVitest No. 5 6.3 No phone appFreeJest No. 6 6.2 No phone appFreeMocha No. 7 6.2 No phone appFree

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