Software Testing by Rajiv Chopra

Author:Rajiv Chopra [Rajiv Chopra]
Language: eng
Format: epub, mobi, pdf
Publisher: Mercury Learning and Information
Published: 2018-02-03T16:00:00+00:00

So, there are 8 possible conditional variants. And we are able to exercise all 8 with only 4 test cases.

Impossible Conditions and Paths

Some predicate domains or programming structures may render a path impossible. There are at least four causes of impossible conditions and paths.

1.Boolean short circuits, as discussed earlier.

2.Contradictory or constraining domains.

Given:

if (x > 2) && (x < 10) then ....

Only three conditions can be obtained. x cannot be simultaneously less than 3 and greater than 9, so the false-false case is impossible.

3.Redundant Predicates.

if (x) <A>

else<B>

endif

if not (x)<C>

else<D>

endif

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