Unfortunately, Xcode puts the binaries for running in the iOS simulator in a rather cryptic directory and we are not aware of an easy method to locate it, but here are the general steps:
Step #1: Open the hidden directory
Libraryin the user's home directory (in Finder press Command+Shift+g and then enter
~/Libraryin the line edit to get to that directory).
Step #2: Navigate to the subfolder
Application Support/iPhone Simulator/<SDK version>/Applications.
Step #3: This folder contains directories with IDs in their names. One of those directories contains the build of the app. Copy that app to some location and use it as AUT in the desired test suite.