Ever wondered how to instrument an existing application for use with the NuBot IVR Testing Platform? My colleague Pascal wrote a helper function in Groovy for easy instrumentation of applications built using the Tropo Scripting API.

The trick is to define a closure encapsulating the playing of DTMF sequences (these sequences are required in order to synchronize the IVR application with the NuBot test scenario):

def sequencer = { sequence, closure ->
    if (dtmfSequencerEnabled) {
        for (dtmf in sequence) {
            switch (dtmf) {
                case "*":say("${baseAudioUrl}/dtmf/star.wav");;
                case "#":say("${baseAudioUrl}/dtmf/pound.wav");
                default:say("${baseAudioUrl}/dtmf/${dtmf.toLowerCase()}.wav");
            }
        }
    }

    if (closure) return closure()
}

Using this definition, one can instrument an application very easily:

sequencer("a") {
    say("Hello. Thank you for calling the Travel Agency Customer Satisfaction Department")
};

The code, as well as a complete NuBot project and a few instrumented Tropo examples, is on github.