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+We're almost at the end of this lesson. In the
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+next two lessons we're going to talk about two main families
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+of testing techniques, black-box testing
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+techniques, and white-box testing techniques. So,
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+what I want to do before getting into the discussion of the
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+specific techniques in this families. I want to give you an
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+overview of what black-box testing and white-box testing are. Black box
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+testing is the kind of testing in which we consider the
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+software as a closed box. That's why it's called black box.
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+So we don't look inside the software, we don't want to
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+look at the code. We just going to look at the description
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+of the software. So this is the testing that is based
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+on a description of the software, which is what we normally
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+call the specification for the software. And what black box testing
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+tries to do is to cover as much specified behavior as
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+possible, and the main limitation black box testing and the reason
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+why this is complimentary to white-box testing is that it cannot reveal
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+errors due to implementation details. Conversely, white-box testing
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+is the kind of testing that looks inside the
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+box. So looks at the code and how
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+the code is written and uses this information to
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+perform the testing. So white-box testing is based
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+on the code, its goal is to cover as
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+much coded behavior in this case, as possible, and
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+its limitation is that unlike black-box testing, it can't
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+reveal errors due to missing paths. Where missing paths are
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+a part of a software specification that are not implemented and
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+the reason why you can not reveal them is because
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+it is focused on the code and not on the specification.