PromptSharp › Prompt Library › Dev & Engineering › Test-plan generator: risk-ranked cases from a diff or spec
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.
How to use this prompt
- Copy the full prompt above with the Copy button.
- Fill in your inputs. Replace each bracketed placeholder with your specifics:
[PASTE SPEC OR DIFF][STACK + TEST FRAMEWORK][WHAT IS ALREADY COVERED] - Paste into ChatGPT, Claude, or Gemini and run. Read the reality guardrail below before you act on the output.
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.
Get a prompt like this every day
The PromptSharp Dev Brief ships one desk-ready prompt every weekday — free on the web today. Free forever. Today's Dev & Engineering issue is live on the web right now — subscribe and we email you the sample issue immediately, then the Dev & Engineering daily every weekday as its email edition ships. Unsubscribe anytime.
Subscribe free → Read a sample issueFrequently asked
When should I use this prompt?
Feature complete, coverage thin. Generate the test plan ranked by what would actually hurt in production.
Why does this prompt work?
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.
What mistake does this prompt help you avoid?
Coverage percentages standing in for safety — risk-ranked behavior coverage by blast radius, plus the non-determinism checklist for flake sources.
Related Dev & Engineering prompts
Edge-case hunt: the failure inputs your happy-path tests will miss
Your tests pass but you don't trust them. Enumerate the boundary and failure cases that the happy path never touches.…
Security-first PR review: a diff read that hunts the bug class, not the typo
You're reviewing a big PR and low on time. Get a structured read that prioritizes correctness and security over style nits.…
Stack-trace triage: from a wall of errors to the two likeliest root causes
Production is throwing and the trace is a mess. Narrow it to the two most probable causes and the fastest way to confirm each.…
Design doc skeleton with the alternatives you'll actually be asked about
New system or big refactor. Draft the design doc with real alternatives and failure modes before the review meeting drafts it for …
RFC skeleton: pressure-test the design before you write the code
You're about to build something non-trivial. Draft an RFC that names the tradeoffs and the rejected alternatives, so review is rea…
Toil audit: find the hours a week your workflow is leaking
You suspect the week disappears into builds, reviews, and context switches. Audit it and get an automation plan with paybacks.…
Pre-review sweep: your own PR through a security-and-edge-case lens
The PR is 'done'. Run the pre-review sweep so human reviewers spend their attention on design — not on nits and the missed null ch…
All Dev & Engineering free prompts
The PromptSharp Dev Brief page — five full free prompts plus today's issue.
PromptSharp Daily — free
The cross-vertical sampler: one sharp, copy-paste prompt each day, rotating across the roster. Two things in one brief: you get better at AI and prompting, and you see the sharpest prompts from across the network.
Double-opt-in. Unsubscribe anytime. No spam, ever.
Even a sharp prompt starts from zero unless your AI knows you. Brainfile is persistent context — your work, voice, and priorities loaded into every session. Brainfile is the memory; PromptSharp is the playbook. Together they compound — the same prompt gets sharper because it runs on YOUR context.
Set up your brainfile →Want both? The All-Access + Brainfile annual bundle covers the pair.
Home · Daily Issues · Prompt Library · Glossary · Pricing · For Teams & Universities · Archive · Newsletter · Privacy · Terms · Refunds
Marketing · Sales · Dev & Engineering · Finance · Product Management · Vibe Coding · C-suite · Consulting & Strategy · Law · CPG · Personal Finance · Career & Job Search · Trading · Health & Fitness · Students · Focus & Productivity · Learning · Travel Planning