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This paper presents an approach for the automatic generation of shortest Distinguishing Sequences (DS) with the Uppaal model checker. The presented method is applicable to a large number of extended finite state machines and it will find an optimal result, if a DS sequence exists for the considered automaton. Our approach is situated in an integrated testing environment that is used to generate checking sequences. The generation method is based on a DS model, which is derived from the same test model that is used for generating test cover sets. The problem of generating DS is reduced to the definition of a DS model and for this reason the complexity of our approach depends mainly on the used model checking algorithm. This means, that the presented method is automatically improved, when the model checking algorithm is improved. This includes the generation of optimal DS depending on the ability of the model checker to produce optimal results.

Generating optimal distinguishing sequences with a model checker

This article presents a method for the application of model checking, i.e., verifying a finite state system against a given temporal specification, on the problem of generating test inputs. The generated test inputs allow state characterization, i.e., the identification of internal states of the software under test by observation of the input/output behavior only. A test model is derived semi-automatically from a given state-based specification and the testing goal is specified in terms of temporal logic. On the basis of these inputs, a model checking tool performs the testing input generation automatically. In consequence, the complexity of our approach is strongly depending on the input model, the testing goal, and the model checking algorithm, which is implemented in the used tool. The presented approach can be adapted with small changes to other model checking tools. It is a capable test generation method, whenever a finite state model of the software under test exists. Furthermore, it provides a descriptive view on state-based testing, which may be beneficial in other contexts, e.g., education and program comprehension.

/pdf/extended-state-identification-and-verification-using-a-model-phbcs65gre.pdf

Extended state identification and verification using a model checker

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Generating optimal distinguishing sequences with a model checker

Extended state identification and verification using a model checker