Refinement-based testing of delta-oriented product lines

We present an approach for specifying and testing delta-oriented software product lines (SPLs) of Java programs. To this end we extend FineFit---a tool and an approach for refinement-based testing of single products. The input to FineFit consists of an abstract model (i.e., the specification of the program) given as a set of tables, and a retrieve function which maps concrete states (of the program under test) to abstract states (of the model). To leverage FineFit for testing of SPLs we propose the concept of delta tables for specifying SPLs, and we use DeltaJ, a delta-oriented programming language, for implementing the retrieve functions of the various software products. Our preliminary investigations suggest that the new ideas can significantly reduce the amount of input, repetition, and mistakes done by the user.