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What is boundary value analysis?

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What is boundary value analysis?

Boundary value analysis is a technique for test data selection. A test engineer chooses values that lie along data extremes. Boundary values include maximum, minimum, just inside boundaries, just outside boundaries, typical values, and error values. The expectation is that, if a systems works correctly for these extreme or special values, then it will work correctly for all values in between. An effective way to test code is to exercise it at its natural boundaries.

Boundary Value Analysis is a method of testing that complements equivalence partitioning. In this case, data input as well as data output are tested. The rationale behind BVA is that the errors typically occur at the boundaries of the data. The boundaries refer to the upper limit and the lower limit of a range of values or more commonly known as the "edges" of the boundary.

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