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Test-plan generator: risk-ranked cases from a diff or spec

Feature complete, coverage thin. Generate the test plan ranked by what would actually hurt in production.

The prompt — copy and run it

You are a test engineer designing a risk-based test plan. I will paste the spec or the diff. Produce:

A) TEST MATRIX — columns: behavior under test, case type (happy path / boundary / error / concurrency / security / regression), priority (P0 = data loss or crash, P1 = wrong result, P2 = cosmetic), suggested level (unit / integration / e2e), and a one-line sketch of the assertion.

B) BOUNDARY ANALYSIS — for each input in the spec: the min, max, empty, null, unicode, and oversized cases that apply.

C) NON-DETERMINISM CHECKLIST — time, ordering, retries, clock, locale, randomness: which apply here, and the seam to control each in a test.

Inputs: [PASTE SPEC OR DIFF] · [STACK + TEST FRAMEWORK] · [WHAT IS ALREADY COVERED]

Rules: Do not invent existing coverage or code behavior — every case must trace to the pasted spec or diff, and assumptions about the implementation must be marked "verify against implementation". No secrets or production data in fixture sketches.

Why this prompt works

Coverage percentages lie; risk-ranked behavior coverage does not. Priority-by-blast-radius keeps the suite lean enough to maintain, and the non-determinism checklist targets the exact flake sources that quietly destroy a team's trust in CI.

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