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Subject: better example on "testable expression" ?
Consider the following as a requirement from a specification on “widgets” :
Here is a test assertion addressing this requirement:
"The TA predicate is worded as an assertion, not as a requirement (the 'MUST' keyword is absent from the predicate but reflected in the prescription level). It has a clear Boolean value: either the statement is true, or it is false for a particular target. In the above case, it is only assumed that the testing environment has the ability to detect rectangular surfaces - e.g. by optical scan. The wording of the predicate takes this reality into account, instead of just repeating the normative statement - so this TA will provide guidance to a test suite writer who is not expert in 3D-geometry "
Jacques
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