1. A computer-implemented method, comprising: obtaining, by a module executed by a data processing system, a delta between a first version of a target program and a second version of the target program that has been tested by one or more test routines; identifying a first portion of the second version of the target program that has not been tested in the first version of the target program and a second portion of the second version of the target program that has been tested in the first version of the target program based on the delta; and executing the one or more test routines on at least the first portion of the second version of the target program without executing the one or more test routines on the second portion of the second version of the target program.