Why? #

• Testing tools should remain external and separate from the target application.
• Automated tests should be managed or reviewed by QA to avoid bottlenecks.
• Including tests in the codebase complicates deployments and delays releases when tests break.
• Under tight deadlines, releasing before testing may be necessary; this is hindered if broken tests are integrated.
• Combining core and test codebases introduces unnecessary libraries into production, complicating builds.
• Separate test code avoids compilation conflicts, allowing QA to improve coverage without delays.
• Mixing test code with development code causes unnecessary branch/merge issues.
• Separation ensures a cleaner, more maintainable codebase focused solely on production needs.
• Isolating test code reduces the risk of test-related bugs affecting production.
• Decoupled tests can be updated and scaled independently of the application, enhancing flexibility.
• QA teams can work on test improvements without interfering with the development cycle, boosting overall productivity.
• Clear separation aids in compliance and audit processes by distinctly outlining testing and production environments.
• Developers can focus on feature development without the overhead of maintaining test scripts.