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Integrated Application of TTCN. Dieter Hogrefe. Peculiarities of Communication Software (Protocols) vs. other types Software. Establishment of states (connection, interface, process) -> state oriented modelling Precisely defined and standardized message formats

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Integrated Application of TTCN


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    1. Integrated Application of TTCN Dieter Hogrefe

    2. SG17 workshop, Sep. 2003

    3. Peculiarities of Communication Software (Protocols) vs. other types Software • Establishment of states (connection, interface, process) -> state oriented modelling • Precisely defined and standardized message formats • The software has to interwork with a large amount of (unknown) implementations • Distribution SG17 workshop, Sep. 2003

    4. Consequences from the peculiarities • Existence of detailed specifications (Internet Draft, ETSI Standard, ITU-T Standard, Proprietary, …)Base Standards and Test Specifications • Specialized (state oriented) specification languages and methods have been developed • Testing against reference implementations (protocol testers • Testing by Interop events, e.g.IPv6 Event, Mandelieu, 23-27 Sep. SG17 workshop, Sep. 2003

    5. Specialized specification languages, methods and tools • Languages:SDL, MSC, TTCN, ASN.1, (UML in the future?) • Methods:- State based modelling- State based verification (e.g. state space exploration)- Systematic test case development based on specialized methodology (ISO 9646, UIO, …) • Tools:Telelogic TAU, Solinet SAFIRE, DANET, DaVinci, TestingTech, … SG17 workshop, Sep. 2003

    6. Testing Language http://www.etsi.org/ptcc/ptccttcn3.htm • Testing and Test Control Notation • Versions 1 and 2 developed by ISO SC21 WG3 (1984 - 1997) as part of the widely-used ISO/IEC 9646 conformance testing standard • ISO/IEC 9646-3 (edition 2) and ITU-T X.292 • Version 3 developed by ETSI TC MTS (1998 - 2000) • Specialist Task Forces STF 133 & STF 156 SG17 workshop, Sep. 2003

    7. Testing Language • One test notation for many testing applications • Cheaper education and training costs • Facilitates the application of a common methodology • Easier maintenance of test suites • Off-the-shelf tools • Universally understood syntax and operational semantics • Tests concentrate on the meaning of the test • Constant maintenance of the language SG17 workshop, Sep. 2003

    8. Motivation for developing • Modernization • technology has changed since TTCN was first developed • Wider scope of application • should be applicable to many kinds of test applications not just conformance (development, system, integration, iop …) • Harmonization • should be the first choice for test specifiers, implementors and users both for standardized test suites ... • … and as a generic solution in industrial product development SG17 workshop, Sep. 2003

    9. Testing Language • Kinds of testing to which TTCN-3 could be applied • - Conformance - Interoperability • - Configuration - Compatibility • - Performance - Stress • - Robustness - Integration • - Functional - Load • - Reliability - Fault tolerance • - Scalability - Degraded mode • - Unit - Product • - Development - Design • - Interface - System SG17 workshop, Sep. 2003

    10. Main Capabilities of • Dynamic concurrent testing configurations • Various communication mechanisms (synch and asynch) • Data and signature templates with powerful matching mechanisms • Specification of encoding information • Display and user-defined attributes • Test suite parameterization • Test case control and selection mechanisms • Assignment and handling of test verdicts • Harmonized with ASN.1 • Different presentation formats • Well-defined syntax, static semantics and operational semantics SG17 workshop, Sep. 2003

    11. Text format Tabular Format Graphical Format PresentationFormat3 PresentationFormatn Core Language • Core format is a text based language • Core can be viewed as text or in various presentation formats TTCN-3 Core Language • Tabular format for conformance testing • Graphical format for visual overview • Other standardized formats in the future • Proprietary formats SG17 workshop, Sep. 2003

    12. ASN.1 Types & Values Other types & Values2 Other types & Valuesn Use with other Languages • TTCN can be integrated with other 'type and value' systems TTCN-3 Core Language • Fully harmonized with ASN.1 (1997) • Harmonization possible with other type and value systems (possibly from proprietary languages) SG17 workshop, Sep. 2003

    13. Test System Architecture Test Data Data Types Test Behaviour Major Elements of • Built-in and user-defined generic data types (e.g., to define messages, service primitives, information elements, PDUs) TTCN-3 Core • Actual test data transmitted/received during testing • Definition of the components and communication ports that are used to build various testing configurations • Specification of the dynamic test system behaviour SG17 workshop, Sep. 2003

    14. Example Core (Text) function PO49901(integer FL) runs on MyMTC { L0.send(A_RL3(FL,CREF1,16)); TAC.start; alt { [] L0.receive(A_RC1((FL+1) mod 2)) { TAC.cancel; verdict.set(pass) } [] TAC.timeout { verdict.set(inconc) } [] any.receive { verdict.set(fail) } } END_PTC1() // postamble as function call } SG17 workshop, Sep. 2003

    15. Example Tabular SG17 workshop, Sep. 2003

    16. Example Graphical SG17 workshop, Sep. 2003

    17. Use of for OSP • Open Settlement Protocol (OSP) • EP TIPHON XML-based protocol • uses TTCN-3 Core Language SG17 workshop, Sep. 2003

    18. Use of for SIP Tests • IETF Session Initiation Protocol (SIP) • RFC 3261 • EP TIPHON SIP Profile • Work was done by STF196 in EP TIPHON • Nokia, Ericsson, GMD Fokus (Testing Tech), ACACIA, FSCOM, GN Nettest • work due to finish December 2003 • executable tests running • TTCN-3 will be used by 3GPP for SIP tests in 2004 SG17 workshop, Sep. 2003

    19. Use of for IP Tests ETSI has work items on developing test suites for • IPv6 Core • IPv6 Security • IPv4-to-v6 Transition Currently under review by DG Enterprise at the Commission for funds from the eEurope initiative WIs for SIGTRAN M3UA, SCTP will be opened in October SG17 workshop, Sep. 2003

    20. Methodology SG17 workshop, Sep. 2003

    21. Methodology SG17 workshop, Sep. 2003

    22. Methodology • UML testing profile • TTCN-3 compatible • JUnit compatible • UML-TTCN-3 profile? SG17 workshop, Sep. 2003

    23. Goals of the UML Testing Profile • Definition of a testing profile to capture all information that would be needed by different test processes • To allow black-box testing (i.e. at UML interfaces) of computational models in UML • A testing profile based upon UML 2.0 • That enables the test definition and generation of structural (static) and behavioral (dynamic) aspects of UML models, and • That is capable of inter-operation with existing test technologies for black-box testing • Define • Test purposes for computational UML models, which should be related to relevant system interfaces • Test components, test configurations and test system interfaces • Test cases in an implementation independent manner SG17 workshop, Sep. 2003

    24. Software Testing like JUnit, TET, etc. Graphical Format of TTCN-3 UML 2.0 Protocol Testing like TTCN-3 MSC-2000 MSC-2000 UML 1.x SDL-2000 Roots of the Testing Profile • Test control • Wildcards • Defaults • Test components • Arbiter • Validation actions • Data pools UML Testing Profile SG17 workshop, Sep. 2003

    25. Concepts of the Testing Profile • Test architecture • Test structure, test components and test configuration • Test data • Data and templates used in test procedures • Test behavior • Dynamic aspects of test procedures • Test time • Time quantified definition of test procedures SG17 workshop, Sep. 2003

    26. Implementations under Development • Eclipse Project Hyades on an Open Source Trace and Test Framework • The test part is based on the U2TP standalone metamodel • Telelogic Tau G2 • The test part is based on the U2TP profile • Microsoft Visual Studio • ITEA Project on Advanced Test Methods and Tools TTmedal SG17 workshop, Sep. 2003

    27. In Summary U2TP • UML Testing Profile provides specification means for test artifacts of systems from various domains • Enhances UML with concepts like test configuration, test components, SUT, verdict and default • Seamlessly integrates into UML: being based on UML metamodel, using UML syntax • Adopted at OMG Technical Meeting, Paris, June 2003 • http://www.fokus.fraunhofer.de/u2tp/ SG17 workshop, Sep. 2003

    28. The End SG17 workshop, Sep. 2003

    29. Questions and Answers SG17 workshop, Sep. 2003