Publish code coverage report with GitLab Pages

GitLab emphasizes the importance of contributions and the extensive use of automated testing to facilitate code changes, which are common in software projects. Code coverage is a key metric used to enhance testing, development, and software quality by mapping application execution to source code during automated tests, helping identify untested code areas. Tools like SimpleCov, particularly for Ruby projects, generate detailed HTML coverage reports that can be published via GitLab Pages, making it easier to spot areas needing improvement. GitLab's CI/CD pipeline allows for the execution of these tests, storing results as artifacts, and publishing them when the code is committed to the master branch, with options for running tests in parallel to reduce execution time. The coverage report can be linked in documentation through badges, offering an accessible overview of test coverage, though GitLab acknowledges that while code coverage improves visibility into untested code, it doesn't necessarily reflect test quality.

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