Testing an iOS app before launch is a crucial step to ensure its quality, stability, and user satisfaction. The process typically includes various stages such as functional testing, performance testing, usability testing, and compatibility testing. It aims to identify and fix any bugs, performance issues, or usability concerns. Testing is usually done on different devices, operating systems, and network conditions to ensure the app works well in various scenarios. Testers use both manual and automated testing methods, leveraging tools like Xcode and third-party frameworks. The ultimate goal is to deliver a bug-free and seamless user experience, meeting the high standards expected from iOS apps.