Boundary Value Analysis

Large number of errors tend to occur at boundaries of the input domain.

BVA leads to selection of test cases that exercise boundary values.

BVA complements equivalence partitioning. Rather than select any element in an equivalence class, select those at the ''edge' of the class.

Examples:

For a range of values bounded by a and b, test (a-1), a, (a+1), (b-1), b, (b+1).

If input conditions specify a number of values n, test with (n-1), n and (n+1) input values.

Apply 1 and 2 to output conditions (e.g., generate table of minimum and maximum size).

If internal program data structures have boundaries (e.g., buffer size, table limits), use input data to exercise structures on boundaries.



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