伪造 Ktor 客户端与仓库
使用 MockEngine 和伪造对象执行确定性测试
伪造 Ktor 客户端与仓库 是 CoddyKit 上的免费 Kotlin Multiplatform Academy 课时。 这是第 3 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 Kotlin Multiplatform Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Kotlin Multiplatform Academy 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。
Tests Should Not Hit the Network
Real HTTP calls are slow and flaky in tests. Instead you fake the response so each run is fast and deterministic. 🎯
Ktor Ships a MockEngine
Ktor includes a built-in MockEngine that returns canned responses instead of making real requests.
Build a Mock Client
Construct an HttpClient on top of MockEngine and decide exactly what bytes and status it replies with.
val client = HttpClient(MockEngine) {
engine { addHandler { respondOk("[]") } }
}Return Custom JSON
Inside the handler, call respond with the JSON body and headers your code expects to parse.
respond(
content = "{\"name\":\"Sam\"}",
headers = headersOf(HttpHeaders.ContentType, "application/json")
)Simulate Errors
Have the handler reply with a status like 500 to verify your error handling without a real server.
respond("oops", HttpStatusCode.InternalServerError)Inject the Client
Your repository should accept its HttpClient as a parameter, so tests pass the mock and production passes the real one.
class UserRepo(private val client: HttpClient)Why a Fake Repository
To test a ViewModel you do not even need Ktor: pass a fake repository that returns fixed data.
Fake an Interface
Because your repo hides behind an interface, a fake is just a small class implementing it with canned results.
class FakeRepo : UserRepo {
override suspend fun load(id: Int) = User("Sam")
}Control Failure Paths
A fake can also throw on demand, letting you test how callers react to a failing data layer.
override suspend fun load(id: Int): User =
throw IOException("offline")Fakes vs Mocks
A hand-written fake is simple and multiplatform-safe, while mocking libraries often lack full Kotlin/Native support.
Deterministic by Design
With MockEngine and fakes, every test controls its inputs, so results never depend on a network or shared state. ✅
Quick Check
Pick the right way to fake HTTP.
Recap
Swap real HTTP for MockEngine and inject fake repositories so tests stay fast, isolated, and predictable.
常见问题解答
「伪造 Ktor 客户端与仓库」课时是免费的吗？
是的 — 「伪造 Ktor 客户端与仓库」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 Kotlin Multiplatform Academy 课程的其余内容，请升级到 CoddyKit PRO。 Kotlin Multiplatform Academy 课程共包含 4 节课。
「伪造 Ktor 客户端与仓库」这节课中我会学到什么？
使用 MockEngine 和伪造对象执行确定性测试 你通过在浏览器中直接运行的动手代码来练习 Kotlin Multiplatform Academy，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 Kotlin Multiplatform Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Kotlin Multiplatform Academy 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 3 节课，共 4 节。
「伪造 Ktor 客户端与仓库」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 Kotlin Multiplatform Academy 课中编写并运行代码吗？
能。每节 Kotlin Multiplatform Academy 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。