Japa vs Testem
Japa
japa.devTestem
github.comSide by side
| Figure | Japa | Testem |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| Plans published | 0 | 1 |
| Spec score · JavaScript Testing Frameworks | 7.4 (#14) | 7.7 (#10) |
| Browser testing | The browser client is built on Playwright and provides browser and context management, built-in assertions, tracing, and headless-mode controls. | It can launch real browsers, including Chrome, Firefox, Safari, and Edge, and provides a Headless Chrome launcher. |
| Integrations | Japa has an official AdonisJS preset, and new AdonisJS applications come preconfigured to use it. | The README describes use with GitHub Actions, Jenkins, and TeamCity. |
| Purpose | Japa is a testing framework for Node.js backend applications and libraries, including JSON API and browser tests. | Testem runs JavaScript tests in real desktop browsers, Node, Chrome, or a configured launcher. |
Plans
In their own words
Japa
Japa is a free testing framework for Node.js backend applications and libraries, including JSON API and browser testing. Tests can be arranged into suites and groups with lifecycle hooks, filtering, asynchronous execution, datasets, snapshots, pinned tests, and bail mode. Assertion choices include Chai-based assert, Jest-style expect, and TypeScript type assertions. Its API client tests endpoints returning JSON, XML, HTML, or plain text, while an OpenAPI plugin checks responses against a schema. Browser testing uses a Playwright-based client with browser and context management, built-in assertions, and tracing options. Coverage reporting is documented with c8 or nyc. Japa has an official VS Code extension and an AdonisJS preset. It has no separate CLI; tests run from a configured entry point with Node.js or Bun. Setup occurs inside an existing Node.js project, where users select assertion libraries and optional plugins. Japa requires Node.js 18 or later, runs without transpilers, and works only with the ES module system.
Testem
Testem is a JavaScript test runner for running tests in Node.js, real desktop browsers, or a launcher you configure. 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, including a Headless Chrome launcher. In development mode, a terminal interface watches project files and reruns tests after relevant changes; CI mode can run tests in available browsers in parallel. Testem includes CI reporters for TAP, dot, xunit, and TeamCity, with custom reporters available. Listed preprocessing support includes Babel, TypeScript, Browserify, ESLint, JSHint, JSLint, and CoffeeScript. Its API provides startDev, startCI, and startServer modes, and coverage reporting is supported. It works with GitHub Actions, Jenkins, and TeamCity. Testem is free and open source under the MIT license, and runs on Linux, macOS, and Windows. It requires a supported Node.js runtime: ^22.17.0, ^24.0.0, or >=26.0.0.