Transforming Graph Based Scenarios into Graph Transformation Based JUnit Tests

This paper describes how the Fujaba CASE tool supports a semi-automatic transformation of usecase scenarios specified by so called story boards into automatic test specifications and test implementations. A story board is a sequence of graph snapshots showing the evolution of a graph based object structure during a typical example execution of an usecase. From such an example execution we automatically derive a test specification that executes the following three basic steps: First, a graph transformation is generated that creates an object structure serving as the test bed for the following steps. Second, we generate an operation that invokes the core method realizing the corresponding usecase. Third, we generate a graph test with a left-hand side corresponding to the graph structure described as result in the story board. On test execution, this graph test validates whether the object structure resulting from the usecase execution matches the results modeled in the usecase scenario. Support for this approach has been implemented within the Fujaba case tool. The approach has been validated in a major research project and in several student projects.