Mochajs
Mocha: The flexible JavaScript test framework for Node.js and browsers
About Mochajs
Mocha is a powerful JavaScript test framework designed for Node.js and browser environments. It simplifies asynchronous testing with serial test execution, precise error reporting, and a customizable interface system. Whether you're testing APIs, UI components, or backend logic, Mocha provides the tools to write clean, maintainable tests with support for spies, mocks, and shared behaviors.
FAQ
To write tests as ES modules, simply end your test file with a .mjs extension or add "type": "module" to your package.json if using the regular .js extension.
Yes, watch mode does not support ES Module test files, and custom reporters and custom interfaces can only be CommonJS files.
If you cannot upgrade to a newer Node.js version, you can add --no-experimental-require-module to the NODE_OPTIONS environment variable.
No, you should hold off on using ES modules for your test files if you are using module-level mocks via libs like proxyquire, rewiremock, or rewire. Consider switching to testdouble, which does support ESM.
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