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+---
+description: 为Kotlin强制执行TDD工作流程。首先编写Kotest测试，然后实施。使用Kover验证80%以上的覆盖率。
+---
+
+# Kotlin TDD 命令
+
+此命令使用 Kotest、MockK 和 Kover 为 Kotlin 代码强制执行测试驱动开发方法。
+
+## 此命令的作用
+
+1. **定义类型/接口**：首先搭建函数签名
+2. **编写 Kotest 测试**：创建全面的测试规范（RED）
+3. **运行测试**：验证测试因正确原因而失败
+4. **实现代码**：编写最少的代码以通过测试（GREEN）
+5. **重构**：在保持测试通过的同时进行改进
+6. **检查覆盖率**：确保使用 Kover 达到 80% 以上的覆盖率
+
+## 何时使用
+
+在以下情况下使用 `/kotlin-test`：
+
+* 实现新的 Kotlin 函数或类
+* 为现有的 Kotlin 代码添加测试覆盖率
+* 修复错误（首先编写失败的测试）
+* 构建关键业务逻辑
+* 学习 Kotlin 中的 TDD 工作流程
+
+## TDD 循环
+
+```
+RED     -> Write failing Kotest test
+GREEN   -> Implement minimal code to pass
+REFACTOR -> Improve code, tests stay green
+REPEAT  -> Next test case
+```
+
+## 示例会话
+
+````text
+User: /kotlin-test I need a function to validate user registration requests
+
+Agent:
+# TDD Session: Registration Validator
+
+## Step 1: Define Interface
+
+```kotlin
+// validator/RegistrationValidator.kt
+package com.example.validator
+
+data class RegistrationRequest(
+    val name: String,
+    val email: String,
+    val password: String,
+)
+
+sealed class ValidationResult {
+    data object Valid : ValidationResult()
+    data class Invalid(val errors: List<String>) : ValidationResult()
+}
+
+fun validateRegistration(request: RegistrationRequest): ValidationResult {
+    TODO("not implemented")
+}
+```
+
+## Step 2: Write Kotest Tests (RED)
+
+```kotlin
+// validator/RegistrationValidatorTest.kt
+package com.example.validator
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.types.shouldBeInstanceOf
+
+class RegistrationValidatorTest : FunSpec({
+    test("valid registration returns Valid") {
+        val request = RegistrationRequest(
+            name = "Alice",
+            email = "alice@example.com",
+            password = "SecureP@ss1",
+        )
+
+        val result = validateRegistration(request)
+
+        result.shouldBeInstanceOf<ValidationResult.Valid>()
+    }
+
+    test("blank name returns Invalid") {
+        val request = RegistrationRequest(
+            name = "",
+            email = "alice@example.com",
+            password = "SecureP@ss1",
+        )
+
+        val result = validateRegistration(request)
+
+        val invalid = result.shouldBeInstanceOf<ValidationResult.Invalid>()
+        invalid.errors shouldBe listOf("Name is required")
+    }
+
+    test("invalid email returns Invalid") {
+        val request = RegistrationRequest(
+            name = "Alice",
+            email = "not-an-email",
+            password = "SecureP@ss1",
+        )
+
+        val result = validateRegistration(request)
+
+        val invalid = result.shouldBeInstanceOf<ValidationResult.Invalid>()
+        invalid.errors shouldBe listOf("Invalid email format")
+    }
+
+    test("short password returns Invalid") {
+        val request = RegistrationRequest(
+            name = "Alice",
+            email = "alice@example.com",
+            password = "short",
+        )
+
+        val result = validateRegistration(request)
+
+        val invalid = result.shouldBeInstanceOf<ValidationResult.Invalid>()
+        invalid.errors shouldBe listOf("Password must be at least 8 characters")
+    }
+
+    test("multiple errors returns all errors") {
+        val request = RegistrationRequest(
+            name = "",
+            email = "bad",
+            password = "short",
+        )
+
+        val result = validateRegistration(request)
+
+        val invalid = result.shouldBeInstanceOf<ValidationResult.Invalid>()
+        invalid.errors.size shouldBe 3
+    }
+})
+```
+
+## Step 3: Run Tests - Verify FAIL
+
+```bash
+$ ./gradlew test
+
+RegistrationValidatorTest > valid registration returns Valid FAILED
+  kotlin.NotImplementedError: An operation is not implemented
+
+FAILED (5 tests, 0 passed, 5 failed)
+```
+
+✓ Tests fail as expected (NotImplementedError).
+
+## Step 4: Implement Minimal Code (GREEN)
+
+```kotlin
+// validator/RegistrationValidator.kt
+package com.example.validator
+
+private val EMAIL_REGEX = Regex("^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$")
+private const val MIN_PASSWORD_LENGTH = 8
+
+fun validateRegistration(request: RegistrationRequest): ValidationResult {
+    val errors = buildList {
+        if (request.name.isBlank()) add("Name is required")
+        if (!EMAIL_REGEX.matches(request.email)) add("Invalid email format")
+        if (request.password.length < MIN_PASSWORD_LENGTH) add("Password must be at least $MIN_PASSWORD_LENGTH characters")
+    }
+
+    return if (errors.isEmpty()) ValidationResult.Valid
+    else ValidationResult.Invalid(errors)
+}
+```
+
+## Step 5: Run Tests - Verify PASS
+
+```bash
+$ ./gradlew test
+
+RegistrationValidatorTest > valid registration returns Valid PASSED
+RegistrationValidatorTest > blank name returns Invalid PASSED
+RegistrationValidatorTest > invalid email returns Invalid PASSED
+RegistrationValidatorTest > short password returns Invalid PASSED
+RegistrationValidatorTest > multiple errors returns all errors PASSED
+
+PASSED (5 tests, 5 passed, 0 failed)
+```
+
+✓ All tests passing!
+
+## Step 6: Check Coverage
+
+```bash
+$ ./gradlew koverHtmlReport
+
+Coverage: 100.0% of statements
+```
+
+✓ Coverage: 100%
+
+## TDD Complete!
+````
+
+## 测试模式
+
+### StringSpec（最简单）
+
+```kotlin
+class CalculatorTest : StringSpec({
+    "add two positive numbers" {
+        Calculator.add(2, 3) shouldBe 5
+    }
+})
+```
+
+### BehaviorSpec（BDD）
+
+```kotlin
+class OrderServiceTest : BehaviorSpec({
+    Given("a valid order") {
+        When("placed") {
+            Then("should be confirmed") { /* ... */ }
+        }
+    }
+})
+```
+
+### 数据驱动测试
+
+```kotlin
+class ParserTest : FunSpec({
+    context("valid inputs") {
+        withData("2026-01-15", "2026-12-31", "2000-01-01") { input ->
+            parseDate(input).shouldNotBeNull()
+        }
+    }
+})
+```
+
+### 协程测试
+
+```kotlin
+class AsyncServiceTest : FunSpec({
+    test("concurrent fetch completes") {
+        runTest {
+            val result = service.fetchAll()
+            result.shouldNotBeEmpty()
+        }
+    }
+})
+```
+
+## 覆盖率命令
+
+```bash
+# Run tests with coverage
+./gradlew koverHtmlReport
+
+# Verify coverage thresholds
+./gradlew koverVerify
+
+# XML report for CI
+./gradlew koverXmlReport
+
+# Open HTML report
+open build/reports/kover/html/index.html
+
+# Run specific test class
+./gradlew test --tests "com.example.UserServiceTest"
+
+# Run with verbose output
+./gradlew test --info
+```
+
+## 覆盖率目标
+
+| 代码类型 | 目标 |
+|-----------|--------|
+| 关键业务逻辑 | 100% |
+| 公共 API | 90%+ |
+| 通用代码 | 80%+ |
+| 生成的代码 | 排除 |
+
+## TDD 最佳实践
+
+**应做：**
+
+* 首先编写测试，在任何实现之前
+* 每次更改后运行测试
+* 使用 Kotest 匹配器进行表达性断言
+* 使用 MockK 的 `coEvery`/`coVerify` 来处理挂起函数
+* 测试行为，而非实现细节
+* 包含边界情况（空值、null、最大值）
+
+**不应做：**
+
+* 在测试之前编写实现
+* 跳过 RED 阶段
+* 直接测试私有函数
+* 在协程测试中使用 `Thread.sleep()`
+* 忽略不稳定的测试
+
+## 相关命令
+
+* `/kotlin-build` - 修复构建错误
+* `/kotlin-review` - 在实现后审查代码
+* `/verify` - 运行完整的验证循环
+
+## 相关
+
+* 技能：`skills/kotlin-testing/`
+* 技能：`skills/tdd-workflow/`