A method includes receiving a first processing request for an application program under test. The method includes generating a second processing request for a model of the application program, wherein the second processing request is equivalent to said first processing request. The method includes communicating said first and second requests to said application program under test and said model of the application program respectively. The method includes receiving a first response data set from the application program under test and a second response data set from the model of the application program. The method includes comparing said first and second response data sets and generating a success indication if said comparing said first and second response data sets does not identify a difference. The method includes generating an error indication if said comparing said first and second response data sets identifies a difference between the first and second data sets.