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contract-testing

Set up Pact tests that record what a frontend expects from an API and verify those expectations against the backend. Review these contract tests to catch incompatible changes and help services be tested and deployed independently.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

원문원문 설명 보기

Use when setting up integration testing for a frontend-backend API boundary, evaluating whether two services are safe to deploy independently, or replacing slow end-to-end tests with contract tests.

설치 방법 보기

이럴 때 유용합니다

  • Set up tests for frontend and backend API compatibility
  • Check whether services can be deployed independently
  • Replace selected slow end-to-end tests with contract tests
  • Review Pact assertions and outdated interactions

포함된 파일(2)

  • SKILL.md2.1 KB
  • references/rule.md10.1 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Implement consumer-driven contract testing for API boundaries

Integration tests that require both services running at the same time are slow, brittle, and hard to maintain. Consumer-driven contract testing decouples the consumer and provider test suites — each team can run their tests independently, yet the broker guarantees that the published contract is always verified against the live provider. This catches API mismatches days earlier than end-to-end tests, with far less infrastructure overhead.

Quick Reference

  • The consumer writes tests that describe what it expects from the API (the "contract")
  • The contract is published to a Pact Broker and verified against the real provider
  • Provider changes that break the contract fail CI before they are deployed
  • This replaces fragile end-to-end tests that require both services to be running simultaneously

Check

Check whether the frontend has consumer-driven contract tests that define and verify the API contract with the backend.

Fix

Add Pact consumer tests for the frontend API client, publish the contracts to a broker, and add provider verification to the backend CI pipeline.

Explain

Explain how consumer-driven contract testing works, what the Pact workflow looks like end-to-end, and how it compares to mocking and end-to-end testing.

Code Review

Review the Pact consumer tests. Flag interactions that are too permissive (any-type matchers on fields the consumer actually uses), missing status code assertions, and interactions for endpoints the consumer no longer calls.


For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/testing/contract-testing

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