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In this case like in many other cases, there's not just a
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single right answer because you can build many test cases that will
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satisfy this test specification. So for example, we could pick value 3
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for a and value 9 for b. Those satisfy the specification because a
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plus b is equal to 12 and therefore is greater than 0,
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and therefore this is a test case that implements this test specification.
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And in terms of results, what we expect to see is in
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the case of a result greater than 0, the caller should be red,
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and the upper value should be 12. And obviously for this test
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specification, we just need to pick two inputs such that the sum
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of the two inputs is less than 0. So for example, we
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could pick minus 5 and minus 8. The output color in this
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case is going to be blue, and the output value is going to be
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minus 13. So, what we just saw is basically how we can
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go from a piece of code to a set of requirements, which
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are the interesting aspects of the code that we want to exercise. How we
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can satisfy the requirements by finding
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the right test specifications, and then how
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we can initiate the test specifications into actual test cases. And this is
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what we will do in general when doing white books testing. And we'll
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do things likely different way, depending on
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the specific criteria that we are considering.
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