微前端之间的契约测试
学习契约测试如何验证微前端对外提供并使用的接口保持兼容，在部署前发现破坏性变更。
微前端之间的契约测试 是 CoddyKit 上的免费 Micro Frontends Architecture with Module Federation 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Micro Frontends Architecture with Module Federation 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
The Integration Gap
Unit tests check one MFE in isolation; E2E tests are slow and brittle. Contract testing fills the gap by verifying the agreements between MFEs without running everything together.
What Is a Contract?
A contract is the shape of an interaction between two parties — the exposed module signature, an event payload, or a shared state shape. Both sides must agree on it.
Consumer-Driven Contracts
In consumer-driven contract testing, the consumer defines what it expects from a provider. The provider then verifies it actually meets those expectations.
Contracts in Federation
For micro frontends, contracts commonly cover:
- Exposed module props/signatures
- Custom event names and payloads
- Shared state structure
- Shared API response shapes
A Props Contract Example
If a remote exposes a Widget, the consumer expects specific props. The contract records those expectations explicitly.
// consumer expects:
// <Widget productId: number, onAdd: function />Writing a Consumer Expectation
The consumer writes a test describing the interface it relies on, generating a contract artifact the provider can check against.
expectInterface("cart/Widget", {
props: { productId: "number", onAdd: "function" }
});Verifying on the Provider Side
The provider runs a verification test confirming its exposed module still satisfies every consumer contract before it deploys.
verifyContracts("cart/Widget"); // fails if props changedEvent Contract Testing
For event-based communication, the contract pins the event name and payload schema, so renaming an event or dropping a field is caught immediately.
{ event: "cart:add", detail: { productId: "number" } }Where Contracts Live
Store contracts in a shared location (a broker or repo) both teams can access. Tools like Pact provide a broker; a shared schema package is a simpler alternative.
Fitting into CI
Run provider contract verification in CI on every change. A broken contract fails the build before the incompatible MFE can reach production.
Benefits of Contract Testing
Contract tests give you:
- Fast feedback without full integration
- Confidence to deploy independently
- Early detection of breaking interface changes
- Clear, documented interfaces between teams
Quick Check
Test your contract-testing knowledge.
Recap
You learned contract testing for MFEs:
- Contracts capture agreements on props, events, and state
- Consumers define expectations; providers verify them
- Store contracts in a broker or shared schema
- Run verification in CI to block breaking changes
- Enables confident independent deployment
Contract tests are the fast middle layer of the MFE testing pyramid.
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常见问题解答
「微前端之间的契约测试」课时是免费的吗？
是的 — 「微前端之间的契约测试」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Micro Frontends Architecture with Module Federation 课程的其余内容，请升级到 CoddyKit PRO。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
「微前端之间的契约测试」这节课中我会学到什么？
学习契约测试如何验证微前端对外提供并使用的接口保持兼容，在部署前发现破坏性变更。 你通过在浏览器中直接运行的动手代码来练习 Micro Frontends Architecture with Module Federation，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Micro Frontends Architecture with Module Federation 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Micro Frontends Architecture with Module Federation 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「微前端之间的契约测试」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Micro Frontends Architecture with Module Federation 课中编写并运行代码吗？
能。每节 Micro Frontends Architecture with Module Federation 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。