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To satisfy our first requirements, we need to find an

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input that causes the execution of this statement. Because this statement

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is executed only when result is greater than zero, our

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test requirement is that a plus b must be greater than

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0. When this is satisfied, this statement is executed therefore

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any test case that implements this specification will cause the execution

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of this statement. Similarly if we want to cover this statement

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which is our second requirement we need to have a result

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that is less than 0. Again, the result is equal

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to a plus b, so all we need to do

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is find the test case such that a plus b

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is less than 0. So this is pretty straight forward.