An in-vehicle infotainment system interoperability testing device for testing the interoperability between an in-vehicle infotainment system and an auxiliary device includes an in-vehicle infotainment system interface arranged to communicatively connect the in-vehicle infotainment system with the testing device. An auxiliary device interface is arranged to communicatively connect the auxiliary device with the testing device. A control is arranged to generate auxiliary device control signals based on at least one test instruction. The control signals are arranged to be transmitted to the auxiliary device, thus causing the desired interaction between the in-vehicle infotainment system and the auxiliary device. An in-vehicle infotainment system behavior logging is arranged to generate a log of behavior in response to the control signals by receiving at least one response signal from the in-vehicle infotainment system, thereby outputting results of at least one interoperability test.