Title: Dealing with Inheritance in OO Evolutionary Testing

Authors:Javier Ferrer and Francisco Chicano and Enrique Alba

Source :GECCO’09, July 8–12, 2009, Montréal Québec,Canada.

Abstract: Most of the software developed in the world follows the object-oriented (OO) paradigm. However, the existing work
on evolutionary testing is mainly targeted to procedural languages. All this work can be used with small changes on OO programs, but object orientation introduces new features that are not present in procedural languages. Some iimportant issues are polymorphism and inheritance. In this
paper we want to make a contribution to the inheritance field by proposing some approaches that use the information of the class hierarchy for helping test case generators to better guide the search. To the best of our knowledge, no work exists using this information to propose test cases. In this work we dedine a branch distance for logical expressions containing the instanceof operator in Java programs. In addition to the distance measure, we propose two mutation operators based on the distance. We study the behaviour pf the mutation operators on a benchmark set composed of nine OO programs. The results show that the information collected from the class hierarchy helps in the search for test cases.

DOI

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