A firewall concept for both control-flow and data-flow in regression integration testing

The authors present a methodology for regression testing and function or system testers. The methodology involves regression testing of modules where dependencies due to both control flow and data flow are taken into account. The control-flow dependency is modeled as a call graph and a firewall defined to include all affected modules which must be retested. Global variables are considered as the remaining data-flow dependency to be modeled. An approach to testing and regression testing of these global variables is given, and a firewall concept for the data-flow aspect of software change is defined