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-Something that we saw when we were looking at the split
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-program before is that if we just combine the interesting values that
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-we identify, we might end up with a lot of cases.
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-4
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-And I mentioned that we, we're going to look at some way of
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-5
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-addressing that problem. And this is exactly what happens in the
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-6
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-next step of the category partition method, in which we identify constraints
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-among choices. And why do we identify these constraints? We do
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-8
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-that to eliminate meaningless combinations of
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-9
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-inputs. If you remember, for example,
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-10
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-we had the case in which we were trying to
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-11
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-create a string with a size less than 0, which
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-doesn't make any sense. And very importantly, we also do
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-that to reduce the number of test cases. Because every time
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-we constrain one of the possible choices, we eliminate possible
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-test cases, so we can use it to keep under
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-control the number of tests that we generate. There are
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-17
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-three types of properties. The
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-18
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-pair property...if, error properties, and properties
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-of type single. So we're going to look at what these
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-properties mean, using, once more, our example of the split program.
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-In particular, we're going to use some of the choices that we
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-identified earlier. So let's look, for example, at choice 0, for
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-23
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-category length of the string. All we can say is that,
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-if the length is 0, this define a special property of
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-the string. And that was specified in this way by saying
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-that this identifies property zerovalue. So every time that we use
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-this choice, zerovalue is defined. At this point, we can use
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-this to exclude some meaningless
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-combinations. For instance, consider special characters.
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-If we have a string of length 0, which means a
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-string with no characters. Obviously, there
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-cannot be special characters. So, considering
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-this combination will just be a waste of time. So what
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-we do is that we specify next to this choice, that we
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-will only consider this if length is not 0. And we
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-36
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-do this by saying that we consider this only if not zerovalue.
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-So, if zerovalue is not defined. So this pair is an
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-example of a property...if case. Define a property and use that
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-property. Now let's look at a case in which we might
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-want to use an error property. For instance, when we look at
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-the category value for the input size, the choice value less
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-than 0 is an erroneous choice. So it's a choice that
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-we selected to test a possibly erroneous situation, so we can
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-mark this as an error property. And what that means is that
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-when generating a combination of choices, we will consider this only
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-once because we assume that we just want to test this error condition
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-once. Finally, the single property is a property that we use
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-when we want to limit the number of test cases. And it's
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-similar as an effect to error. It just has a different
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-meaning. So what we do when we use the single property is
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-that we're saying that this choice, we want to use in only
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-one combination. So don't combine it multiple times. And that, of course,
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-given the combinatorial nature of the problem, cuts down dramatically
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-the number of test cases. And we might use, for
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-instance, the single property for maxint, which means that we
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-will only have one test case in which the size is
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-equal to maxint. We're actually going to see a demo
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-on this topic so we'll have more chances of seeing how
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-properties work in practice and how good they are at
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-eliminating meaningless combinations and at reducing the number of test cases.