System Safety Property-oriented Test Sequences
Generating Method Based On Model Checking
Author(s)
Y. Zhang, X. Q. Zhao, W. Zheng & T. Tang
Abstract
In this study, model checking is used to generate a suite of test sequences to
validate whether the System Under Test (SUT) satisfies the defined safety
properties. Firstly, a Coloured Petri Net (CPN) model is abstracted and derived
from the system requirement specification of the SUT with a hierarchical
modelling approach. A state space analysis is used to verify the model with
respect to a set of correctness criteria that include the absence of deadlocks and
livelocks. Secondly, some system safety properties defined by the experts are
described with a non-standard query and extended computation tree logic.
Finally, based on the model without deadlocks and livelocks, the negation of
safety properties could be checked by analyzing the occurrence graph and the
strongly connected components graph of the model. If the model does not satisfy
the specified property, the process of model checking could return some
counterexamples. From these counterexamples, the nodes and directed arcs that
include the interface information are picked out as the interface messages, which
are used to construct a test sequence. A case study of using this method on a
railway control system is presented, where the CPN Tools is used to model and
generate test sequences. All reachable states are analyzed to detect violations and
generate the safety related test sequences, which include the required data to be
executed on the SUT. The result shows this method is time-saving, labour-saving
and can guarantee the conformance between the SUT and the safety properties.
Keywords: model checking, test sequence generation, CPN, railway control.
Keywords
model checking, test sequence generation, CPN, railway control
Related Book
Other papers in this volume
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