ESM Unit vs Mocha
ESM Unit
github.com
Mocha
mochajs.orgSide by side
| Figure | ESM Unit | Mocha |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | — | Yes |
| Plans published | 0 | 1 |
| Spec score · JavaScript Testing Frameworks | 7.3 (#15) | 7.7 (#9) |
| Browser support | The README shows running tests in Chrome, Firefox, and Safari; headless mode is supported only in Chrome and Firefox. | Mocha provides browser builds and documents support for evergreen browser versions including Chrome, Edge, Firefox, and Safari. |
| Founded | 1983 | 2011 |
| Purpose | ESM Unit is a unit testing tool for native ECMAScript modules in web browsers. | Mocha is a JavaScript test framework that runs on Node.js and in browsers. |
| Support | The project README invites users to open an issue or pull request and says it welcomes contributions. | The project points users to its Discord and documentation explainers for additional information. |
Plans
In their own words
Mocha
Mocha is a free, open-source JavaScript test framework that runs in Node.js and browsers. Tests run serially by default, and uncaught exceptions are associated with their test cases. Asynchronous tests can use callbacks or returned promises, while parallel execution is available in Node.js but not in browsers. The command-line interface defaults to the BDD interface and spec reporter; browser runs default to the HTML reporter, and reporters can be configured. Installation as a development dependency is documented for npm, pnpm, and yarn. Mocha 12 requires Node.js ^20.19.0 or >=22.12.0, and browser builds document support for evergreen Chrome, Edge, Firefox, and Safari. It supports JavaScript and TypeScript, parameterized cases, and lists editor-related packages for TextMate, JetBrains IDEs, Wallaby.js, Emacs, and VS Code. Built-in mocks are not included. The project points users to Discord and documentation explainers for more information.