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And the reason for this is because testing is inherently
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incomplete. So let me re-size this a little bit, so that
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I can make room for an illustration. And what I'm
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going to show you here is just a reminder, that when we
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test, we have a huge virtually infinite input domain, and
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we have to derive from this input domain a few test
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cases. By picking specific inputs in the domain, and of
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course, corresponding outputs. And so what happens normally is that these
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test cases represent the teeny tiny fraction of
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the domain, and therefore testing is always incomplete.
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