boundary value analysis
📗 CTFL
Official ISTQB Definition
A black-box test technique in which test cases are designed based on boundary values.
3 Ways to Think About It
The Quick Take
Testing at the edges of input ranges where bugs love to hide.
Look Closer
Focusing on boundary points: the minimum, maximum, and values just inside/outside limits.
The Bottom Line
If the valid range is 1-100, test 0, 1, 100, and 101 — that's where bugs live.
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