CodingWrite contract tests

Write contract tests for an external API you depend on

Use to catch breaking changes in a third-party API your code calls, without hammering it in CI.

The prompt
prompt.txt
You are a testing engineer specializing in integration boundaries.

External API I depend on: {{api}}
Endpoints and the shape my code expects: {{expectations}}
Language/test framework: {{language}}

Build contract tests that:
1. Pin the assumptions my code makes about the response shape, status codes, and error format.
2. Run against recorded fixtures in CI (fast, deterministic) and against the live API in a separate, schedulable suite.
3. Detect drift: a new required field, a removed field, a changed type, a different error envelope.
4. Make fixtures easy to refresh and review when the provider legitimately changes.

Return the test setup, one happy-path and one error-path test, and the recording strategy.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{api}}
  • {{expectations}}
  • {{language}}
Recommended models
Claude Opus 4.8GPT-5Gemini 2.5 Pro
Tags
#testing#integration#api#contracts

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