ESM Unit vs Testem
ESM Unit
github.comTestem
github.comSide by side
| Figure | ESM Unit | 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 | 7.3 (#15) | 7.7 (#10) |
| Integrations | The README recommends Sinon for stubbing, mocking, and assertions against mocks. | The README describes use with GitHub Actions, Jenkins, and TeamCity. |
| License | The repository license identifies the software as Apache License 2.0 and states that it is provided without warranties or conditions. | The repository identifies the project as MIT licensed. |
| Purpose | ESM Unit is a unit testing tool for native ECMAScript modules in web browsers. | Testem runs JavaScript tests in real desktop browsers, Node, Chrome, or a configured launcher. |
Plans
In their own words
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.