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Section: New Software and Platforms
Testing Tools
Participants : Fabrice Bouquet, Frédéric Dadeau, Elizabeta Fourneret.
Hydra
Hydra is an Eclipse-like platform, based on Plug-ins architecture. Plug-ins can be of five kinds: parser is used to analyze source files and build an intermediate format representation of the source; translator is used to translate from a format to another or to a specific file; service denotes the application itself, i.e., the interface with the user; library denotes an internal service that can be used by a service, or by other libraries; tool encapsulates an external tool. The following services have been developed so far:
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BZPAnimator: performs the animation of a BZP model (a B-like intermediate format);
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Angluin: makes it possible to perform a machine learning algorithm (à la Angluin) in order to extract an abstraction of a system behavior;
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UML2SMT: aims at extracting first order logic formulas from the UML Diagrams and OCL code of a UML/OCL model to check them with a SMT solver.
These services involve various libraries (sometimes reusing each other), and rely on several tool plug-ins that are: SMTProver (encapsulating the Z3 solver), PrologTools (encapsulating the CLPS-B solver), Grappa (encapsulating a graph library). We are currently working on transferring the existing work on test generation from B abstract machines, JML, and statecharts using constraint solving techniques.
jMuHLPSL
jMuHLPSL [6] is a mutant generator tool that takes as input a verified HLPSL protocol, and computes mutants of this protocol by applying systematic mutation operators on its contents. The mutated protocol then has to be analyzed by a dedicated protocol analysis tool (here, the AVISPA tool-set). Three verdicts may then arise. The protocol can still be safe, after the mutation, this means that the protocol is not sensitive to the realistic “fault” represented by the considered mutation. This information can be used to inform the protocol designers of the robustness of the protocol w.r.t. potential implementation choices, etc. The protocol can also become incoherent, meaning that the mutation introduced a functional failure that prevents the protocol from being executed entirely (one of the participants remains blocked in a given non-final state). The protocol can finally become unsafe when the mutation introduces a security flaw that can be exploited by an attacker. In this case, the AVISPA tool-set is able to compute an attack-trace, that represents a test case for the implementation of the protocol. If the attack can be replayed entirely, then the protocol is not safe. If the attack can not be replayed then the implementation does not contain the error introduced in the original protocol.
The tool is written in Java, and it is freely available at: http://members.femto-st.fr/sites/femto-st.fr.frederic-dadeau/files/content/pub/jMuHLPSL.jar .
Praspel
Praspel is both a specification language, a test data generator and test execution driver for PHP programs. These latter are annotated to describe class (resp. method) contracts using invariants (resp. pre- and postconditions). Praspel contracts allow to describe data typing informations, by means of realistic domains. According to the contract-driven testing principles, the tool uses the contracts to both generate test data, using dedicated test generators (random for integer variables, grammar-based for strings, constraint-based for arrays), and establish the test verdict by checking the contract assertions at run-time.
The tool is open source and freely available at: http://hoa-project.net . It has been integrated into a PHP framework named Hoa, and coupled with the atoum tool (https://github.com/atoum/atoum ) that can be used to execute the tests and report on their code coverage.