Which testing framework allows parallel testing across different browsers?

• A. JUnit
• B. Puppeteer
• C. TestNG
• D. Mocha

Answer: (C)

TestNG is a powerful testing framework inspired by JUnit but designed to overcome some of its limitations, particularly when it comes to test configuration and data-driven testing. One of the notable features of TestNG is its built-in support for parallel testing, enabling the execution of tests simultaneously across different browsers and machines.

This parallel execution capability is particularly advantageous for large test suites, as it significantly reduces the overall testing time. By allowing tests to run concurrently, TestNG can utilize multiple threads effectively, making it easier to manage cross-browser testing where different browser environments need to be validated.

While other frameworks like JUnit and Mocha provide various functionalities for testing, they may require additional setup or custom configurations to achieve parallel execution, and typically focus more on unit tests rather than end-to-end or integration testing scenarios that involve multiple browsers. Puppeteer, on the other hand, is primarily a Node.js library for automating Chrome and does not inherently provide parallel testing support across multiple browsers, as it is limited to Chrome-based environments. Thus, TestNG stands out for its built-in support for parallel testing across different browsers, making it the suitable choice for this question.