The article provides an in-depth guide on using GitLab CI to run tests locally, emphasizing its advantages over traditional methods like Jenkins. GitLab CI is a continuous integration/continuous delivery (CI/CD) server that automates code testing with scripts triggered by code pushes to a repository, ensuring any changes meet predefined standards. The text highlights the challenges of local testing, such as limited browser and operating system coverage, and how GitLab CI's features, like multi-platform support and autoscaling, address these issues. By utilizing Docker and the GitLab Runner, developers can replicate CI environments locally to troubleshoot and optimize code before deploying. The article also introduces the LambdaTest Tunnel for further testing capabilities across various browser environments, ensuring cross-platform compatibility. It concludes by encouraging the integration of Selenium test suites with GitLab CI via LambdaTest for a robust automated testing pipeline, ultimately providing developers with the confidence needed for successful production deployments.