Test Automation Feature in Xcode 4

Do anybody knows what is Test 开发者_Python百科Automation Feature in Xcode4 and how it can be beneficial???

Using Automation, you can write UI test javascripts to step through your application's UI.

Definitely, Frank is one of the good automated testing tool for acceptance testing of mobile applications. But, Frank does not support test automation if the source code of mobile app is not available