I can provide some general insights into how software testing is typically done at large technology companies like Facebook:

Test Automation: Companies like Facebook heavily invest in test automation. They develop automated test scripts that cover a wide range of scenarios, from unit tests to end-to-end tests. This automation helps ensure that changes made to the codebase don’t introduce new bugs.

Continuous Integration (CI): Facebook, like many tech giants, uses CI systems that automatically build, test, and validate code changes as they are committed to the version control system. This rapid feedback loop allows issues to be detected and fixed quickly.

Code Reviews: Code changes at Facebook usually go through a rigorous code review process. During code reviews, engineers assess the quality, functionality, and test coverage of the changes. This helps catch issues early in the development process.

A/B Testing: Facebook often employs A/B testing to validate changes in the user interface and functionality. A small subset of users is exposed to the changes, and their behavior is closely monitored to assess the impact on user engagement and satisfaction.

Beta Testing: Before rolling out major updates or features to all users, Facebook may conduct beta testing. This involves releasing the changes to a limited group of users who provide feedback and report issues.

Monitoring and Incident Response: Facebook uses sophisticated monitoring tools to track the performance and reliability of its services in real-time. When issues arise, incident response teams work quickly to diagnose and resolve them.

Regression Testing: Regression tests are run regularly to ensure that new code changes haven’t introduced regressions, i.e., unintended side effects or defects in existing functionality.

Load and Performance Testing: Facebook tests its systems for scalability and performance under various loads. This ensures that the platform can handle the vast number of users and interactions it experiences daily.

Security Testing: Given the importance of user data and privacy, Facebook places a significant emphasis on security testing. This includes vulnerability scanning, penetration testing, and code analysis to identify and address security weaknesses.

User Feedback and Bug Reporting: Facebook encourages its user base to report issues and provide feedback. The company has mechanisms in place for users to report bugs and suggest improvements, which can then be incorporated into the testing and development process.

Please note that specific practices and tools may vary over time, and Facebook continually evolves its testing processes to maintain the quality and reliability of its platform. For the most up-to-date information on how Facebook conducts software testing, it’s best to refer to their official engineering blogs, publications, or reach out to current or former employees familiar with their testing practices. https://sites.google.com/sevenmentor.com/software-testing-course/home