What is boundary value analysis in test design techniques?

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Boundary Value Analysis (BVA) is a black-box test design technique used to identify errors at the edges of input ranges rather than within the middle. It’s based on the idea that software is more likely to fail at the boundaries between valid and invalid input than in the center of valid input.

In BVA, test cases are designed to include values at:

• The minimum boundary (just inside and just outside),

• The maximum boundary (just inside and just outside),

• And sometimes the exact boundaries themselves.

For example, if an input field accepts values from 1 to 100:

• The typical BVA test inputs would be: 0, 1, 2, 99, 100, 101. These represent just outside, on the edge, and just inside the boundary.

BVA is often applied alongside Equivalence Partitioning, where input data is divided into valid and invalid classes. While Equivalence Partitioning chooses representative values from each class, BVA targets the transition points between them.

Why it matters:

• Many defects occur at the boundaries due to errors in conditional logic (e.g., using >= vs >).

• It’s a cost-effective way to catch edge-case bugs without exhaustive testing.

BVA is widely used in both manual and automated testing, especially for input validation, range checking, and UI forms.

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