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So, now I want to do a little quiz about

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identifying testable features. Let's consider

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this simple problem called printSum.

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We won't see the implementation because we are doing black-box

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testing. And all we need to know is that printSum takes

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two integers, a and b, and prints the sum of

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these two numbers. So what I want to ask, is

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how many independently testable features do we have here? Do

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we have one, two, three features? Or more than three features?