Mocha vs WSO2 Contract Test Runner

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.

WSO2 Contract Test Runner is a free, Apache-2.0-licensed library for consumer-based testing of live REST API endpoints. It sends requests and compares returned data with expected responses defined in JSON contracts. A contract can include a request, expected response, assertions, and optional post-conditions. Assertions cover status codes, JSON body and header paths, exact values, regular expressions, emptiness, structures, arrays, and objects. Tests run through Docker by mounting contract and configuration files into the documented image workflow. Suites can run contracts before or after tests, with before-suite contracts running synchronously. Post-conditions can place extracted values into suite-scoped or global environment variables, and contracts can pause for a specified number of seconds. The sample setup uses bearer authorization, cookies, a certificate keystore, and a client truststore. XML path support is listed as a todo. Deployment is Linux and self-hosted.