A simulator for testing a wireless device is configured by using an indication of connected devices and channel model to be applied to an identified link received as input to calculate settings for function elements which modify signals to implement simulated effects defined by the channel model. The calculations are performed while a test is running, thereby avoiding delays associated with playback tests. Allocation of simulator paths and function elements are automated, and an indication of how the wireless devices are to be connected to the simulator is provided to the user.