Like any software project with lots of moving parts, it would be great if one could develop an iOS app in a vacuum, writing tests as required, and using them to

Like any software project with lots of moving parts, it would be great if one could develop an iOS app in a vacuum, writing tests as required, and using them to guarantee a perfect product. In reality, that never works. I would expect that these features are actually mostly used by QA or product owners for acceptance testing. The reason they typically exist in my experience is that it can be difficult to trigger the conditions required using other means.