Adding test target not work in Xcode 6

Hi,


I am trying to add a test target in my current project using "+" sign at the bottom of the left column of "Test Navigator" (XCode 6.3.2). The target is created but never appear in the left column... and also, not appear in the test section of my scheme. It seem that this problem is related to my project, because it is working perfectly with template projects provided by XCode. My project document format was set to XCode 3.2, and now is set to 6.3, but it is still not working.


Do you have an idea?


Thanks!


David