使用 WireMock 测试外部 API
通过使用 WireMock 为外部 HTTP 服务设置模拟行为，而不是访问网络，对调用这些服务的代码进行集成测试。
使用 WireMock 测试外部 API 是 CoddyKit 上的免费 Testing Mastery: JUnit, Mockito & Integration Tests 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 Testing Mastery: JUnit, Mockito & Integration Tests 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Testing Mastery: JUnit, Mockito & Integration Tests 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 External Dependency Problem
Integration tests often touch real collaborators, but calling a live third-party API is slow, flaky, and may cost money. WireMock runs a local HTTP server you can program to mimic that API.
What WireMock Provides
WireMock lets you:
- Stub HTTP responses for specific requests
- Simulate delays, errors, and edge cases
- Verify that your code made the expected calls
Starting a WireMock Server
In JUnit you start WireMock on a port (or a random one) before tests run.
WireMockServer server =
new WireMockServer(options().dynamicPort());
server.start();Stubbing a Response
Tell WireMock how to respond to a request using its fluent builder.
server.stubFor(get(urlEqualTo("/users/1"))
.willReturn(aResponse()
.withStatus(200)
.withBody("{\"id\":1}")));Pointing Your Client at WireMock
Configure the code under test to use WireMock's base URL. Using the dynamic port keeps tests isolated.
String baseUrl =
"http://localhost:" + server.port();
UserClient client = new UserClient(baseUrl);Exercising the Code
Now call your client. It hits WireMock, which returns the stubbed payload, and your assertions check the parsed result.
User u = client.fetch(1);
assertEquals(1, u.getId());Simulating Failures
Return a 500 or a malformed body to test your error handling and retries.
server.stubFor(get(urlEqualTo("/users/2"))
.willReturn(aResponse().withStatus(500)));Simulating Latency
Add a fixed delay to verify timeout handling.
server.stubFor(get(anyUrl())
.willReturn(aResponse()
.withFixedDelay(3000)));Verifying Requests
WireMock can assert that your code actually made a call with the right method, path, and headers.
server.verify(getRequestedFor(
urlEqualTo("/users/1")));Cleaning Up
Stop the server after tests, and reset stubs between tests so they stay independent.
server.resetAll();
server.stop();Where It Fits
WireMock sits between unit tests (which mock objects) and full E2E tests (which use real services). It gives realistic HTTP behavior without external dependencies.
Quick Check
What is the main reason to use WireMock in integration tests?
Recap
You learned to test external API calls:
- WireMock runs a local programmable HTTP server
- Stub responses, errors, and delays with its builder
- Point your client at the dynamic port
- Verify requests and reset between tests
常见问题解答
「使用 WireMock 测试外部 API」课时是免费的吗？
是的 — 「使用 WireMock 测试外部 API」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 Testing Mastery: JUnit, Mockito & Integration Tests 课程的其余内容，请升级到 CoddyKit PRO。 Testing Mastery: JUnit, Mockito & Integration Tests 课程共包含 4 节课。
「使用 WireMock 测试外部 API」这节课中我会学到什么？
通过使用 WireMock 为外部 HTTP 服务设置模拟行为，而不是访问网络，对调用这些服务的代码进行集成测试。 你通过在浏览器中直接运行的动手代码来练习 Testing Mastery: JUnit, Mockito & Integration Tests，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 Testing Mastery: JUnit, Mockito & Integration Tests 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Testing Mastery: JUnit, Mockito & Integration Tests 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。
「使用 WireMock 测试外部 API」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 Testing Mastery: JUnit, Mockito & Integration Tests 课中编写并运行代码吗？
能。每节 Testing Mastery: JUnit, Mockito & Integration Tests 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。