Each node can be tested against its input schema, output invariants, allowed side effects, latency, and known edge cases. Local tests complement end-to-end evaluation by identifying the failing boundary.

Node Contract Tests Localize Failures

In this situation—testing a router with uncertain and out-of-scope requests—which choice best applies “Node Contract Tests Localize Failures”?

When no single gold answer exists, a metamorphic test defines how output should behave under a known input transformation. It checks invariants such as order independence or permission monotonicity.

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