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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : X.291
Title : OSI conformance testing methodology and framework for protocol
recommendations for CCITT applications - abstract test suite
specifications
Study Group : VII - Data Communications Networks
Version : New
Date of adoption : 1992
Notes : Also published as ISO/IEC 9646-2: 1991
Recommendation X.291 provides a common approach to the specification
of OSI conformance test suites at a level which is independent of the
means of executing those test suites (hereafter called "abstract test
suites"). This level of abstraction is suitable for standardization
and facilitates the comparison of results produced by different
organizations which run the corresponding executable test suites.
It recalls that there are requirements on OSI protocol specifiers
which have to be fulfilled before there can be an objective basis for
the process of developing an abstract test suite. The need is
expressed for consistent conformance clauses and for PICS proformas in
CCITT Recommendations or International Standards which specify OSI
protocol standards.
It describes the process of developing an abstract test suite,
including the design criteria to be used and guidance on its structure
and coverage. The possible abstract test methods are defined and
guidance is given to help the test suite specifier to decide which
test method(s) to use in the production of a particular test suite.
Requirements and guidance are given on the specification of abstract
test cases. These include the subdivision of test cases into test
steps and the assignment of test verdicts to test outcomes.
The test suite specifier is also required to provide information to
the test realizers (e.g. limitations governing test case selection).
Finally, guidance and requirements are given on test suite
maintenance.
Recommendation X.291 specifies the requirements and gives guidance for
the production of system-independent conformance test suites for one
or more OSI CCITT Recommendations or International Standards. In
particular, it is applicable to the production of all conformance
testing standards for OSI and ISDN two-party protocols, including all
draft versions of such conformance testing standards.
Recommendation X.291 is applicable to the production of conformance
test cases which check the conformance of an implementation to the
relevant static and/or dynamic conformance requirements by controlling
and observing protocol behaviour. The Abstract Test Methods included
in Recommendation X.291 are, in fact, capable of being used to specify
any test case which can be expressed abstractly in terms of control
and observation of Protocol Data Units and Abstract Service
Primitives. Nevertheless, for some protocols, test cases may be needed
which cannot be expressed in these terms. The specification of such
test cases is outside the scope of Recommendation X.291, although the
test cases may themselves need to be included in a conformance testing
standard. For example, some static conformance requirements related to
an Application service element may require testing techniques which
are specific to that particular Application.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).