Seguí este sitio para comenzar con UI Automation.http://blog.manbolo.com/2012/04/08/ios-automated-tests-with-uiautomation#1.2

Estoy tratando de iniciar instrumentos desde la línea de comandos. Desafortunadamente me sale un error:

2013-03-14 14:06:36.376 instruments[17854:1207] Connection to the remote device lost while launching target. Aborting...
2013-03-14 14:06:36.378 instruments[17854:1207] Recording cancelled : At least one target failed to launch; aborting run
Instruments Trace Error : Failed to start trace.

Este es el comando que utilicé:

instruments -w {deviceId} -t /Applications/Xcode.app/Contents/Applications/Instruments.app/Contents/PlugIns/AutomationInstrument.bundle/Contents/Resources/Automation.tracetemplate {appname} -e UIASCRIPT /Path/to/Script.js

Actualmente estoy usando Xcode 4.6.