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Subject: Re: [tag] Groups - TA Anatomy V0.4 (AnatomyTA-v04.doc) uploaded
I think we are saying the test result should be discarded as 'inapplicable', 'fail'(??), 'error' or 'inconclusive' if the post condition isn't true or pass. We do have a legacy of uncertainty about post conditions (I find it unclear how a condition is post and not pre) but it is part of things we should align to, I guess. Some just use it as an extension of 'result', others as a way to describe preconditions for a subsequent step in the flow (a precondition before considering the next step perhaps) We kind of accept that a post condition is like a result but doesn't determine the result, it determines the final value of the TA as whole. I agree with your clarification that we should consider particularly this overall outcome result. It has to be distinguished from the flow result (and would be likely to have a set of values including pass and fail whereas the flow result is more likely to evaluate to true or false) -- Stephen Green Partner SystML, http://www.systml.co.uk Tel: +44 (0) 117 9541606 http://www.biblegateway.com/passage/?search=matthew+22:37 .. and voice Quoting Dave Pawson <dave.pawson@gmail.com>: > On 21/09/2007, stephen.green@systml.co.uk <stephen.green@systml.co.uk> wrote: >> So there is no pass or fail of the TA I gather >> but isn't it written as if there is? That confuses me a bit >> (it needs careful wording which I haven't attempted to figure out). >> >> The TA isn't the test case so it doesn't evaluate to anything. >> It just gives information to the test case about how it ought >> to be evaluated to fulfil spec requirements, say (or on the >> test based on the test case based on the TA). >> >> Yet we have determined the beginning of rules to say something like >> that a postcondition or precondition which evaluates to false means the test >> should evaluate to 'not applicable'. > > > How can test execution be based on a post condition? > > The post condition is established when the test has run, > hence cannot be used by the test, since by definition it > has not completed if it is evaluating a post condition? > > regards > > > > > > -- > Dave Pawson > XSLT XSL-FO FAQ. > http://www.dpawson.co.uk >
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