Boundary & edge-case testing

How it works

Failures cluster at boundaries: the edge of the context window, unusually long lists, zero/one/many counts, maximum output length. Systematically walking inputs toward these limits exposes degradation that mid-range testing misses.

When to use it

Whenever input size, length, or count varies in production; long-context and structured-output features especially.

Limitations

Boundaries shift between model versions; tests need re-validation after upgrades.

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