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Conformance Testing with State Mapping

Conformance Testing with State Mapping. Vadim Mutilin ISP RAS. Conformance Testing. Implementation. Specification. Sys. M. conforms-to?. Test suite. Test case. T. t. *. Sys passes T. T is sound if Sys conforms-to M => Sys passes T

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Conformance Testing with State Mapping

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  1. Conformance Testing with State Mapping Vadim Mutilin ISP RAS

  2. Conformance Testing Implementation Specification Sys M conforms-to? Test suite Test case T t * SyspassesT T is sound if Sysconforms-toM => SyspassesT T is complete if Sysconforms-toM <=> SyspassesT

  3. State Mappings • MAPPINGS: SPECS×IMPLSFUNCS • f=MAPPINGS(M,Sys) • f:SSysSM • In practice: • Reading an implementation state • Converting it into a specification one

  4. Example

  5. Differences from FSM-based Testing • FSM vs. Labelled Transition System (LTS) • Equivalence vs. Conformance relation • Status message vs. State mapping

  6. Test cases • ISO IS-9646 “OSI Conformance Testing Methodology and Framework” • OMG “UML Testing Profile” • Tretmans formalization: • Labelled transition system ‹S, L, T, s0› • Test case ‹St, L, Tt, ν, s0t›, • ν : St → {pass, fail} – verdict function. • Test run – synchronous parallel composition t||Sys (in initial state)

  7. Composite Test Suites

  8. Derived Test Suite T3=Derived(Te3) • SyspassesTe<=> Syspasses Derived(Te)

  9. Time of Test Execution • ρ(Te)<=ρ(Derived(Te)) • In example ρ(Te3) = 20 <=ρ(T3) = 53 • When < • Circles • Non-determination

  10. Conclusions and Future Work • Theory • More efficient way of writing test suites • Practice • UniTESK formalized as FSM-based testing • Future • Conditions for test suite completeness

  11. Thank you!Questions? Vadim Mutilin (ISP RAS) mutilin@ispras.ru

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