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chore: import upstream snapshot with attribution
2026-07-13 11:55:55 +08:00

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---
paths:
- "**/*.kt"
- "**/*.kts"
---
# Kotlin テスト
> このファイルは [common/testing.md](../common/testing.md) を Kotlin および Android/KMP 固有のコンテンツで拡張します。
## テストフレームワーク
- **kotlin.test** — マルチプラットフォーム(KMP)用(`@Test``assertEquals``assertTrue`
- **JUnit 4/5** — Android 固有のテスト用
- **Turbine** — Flow と StateFlow のテスト用
- **kotlinx-coroutines-test** — コルーチンテスト用(`runTest``TestDispatcher`
## Turbine を使った ViewModel テスト
```kotlin
@Test
fun `loading state emitted then data`() = runTest {
val repo = FakeItemRepository()
repo.addItem(testItem)
val viewModel = ItemListViewModel(GetItemsUseCase(repo))
viewModel.state.test {
assertEquals(ItemListState(), awaitItem()) // 初期状態
viewModel.onEvent(ItemListEvent.Load)
assertTrue(awaitItem().isLoading) // ローディング中
assertEquals(listOf(testItem), awaitItem().items) // ロード完了
}
}
```
## モックよりもフェイクを優先
モッキングフレームワークよりも手書きのフェイクを優先する:
```kotlin
class FakeItemRepository : ItemRepository {
private val items = mutableListOf<Item>()
var fetchError: Throwable? = null
override suspend fun getAll(): Result<List<Item>> {
fetchError?.let { return Result.failure(it) }
return Result.success(items.toList())
}
override fun observeAll(): Flow<List<Item>> = flowOf(items.toList())
fun addItem(item: Item) { items.add(item) }
}
```
## コルーチンテスト
```kotlin
@Test
fun `parallel operations complete`() = runTest {
val repo = FakeRepository()
val result = loadDashboard(repo)
advanceUntilIdle()
assertNotNull(result.items)
assertNotNull(result.stats)
}
```
`runTest` を使用する — 仮想時間を自動的に進め、`TestScope` を提供する。
## Ktor MockEngine
```kotlin
val mockEngine = MockEngine { request ->
when (request.url.encodedPath) {
"/api/items" -> respond(
content = Json.encodeToString(testItems),
headers = headersOf(HttpHeaders.ContentType, ContentType.Application.Json.toString())
)
else -> respondError(HttpStatusCode.NotFound)
}
}
val client = HttpClient(mockEngine) {
install(ContentNegotiation) { json() }
}
```
## Room/SQLDelight テスト
- Room: インメモリテストには `Room.inMemoryDatabaseBuilder()` を使用
- SQLDelight: JVM テストには `JdbcSqliteDriver(JdbcSqliteDriver.IN_MEMORY)` を使用
```kotlin
@Test
fun `insert and query items`() = runTest {
val driver = JdbcSqliteDriver(JdbcSqliteDriver.IN_MEMORY)
Database.Schema.create(driver)
val db = Database(driver)
db.itemQueries.insert("1", "Sample Item", "description")
val items = db.itemQueries.getAll().executeAsList()
assertEquals(1, items.size)
}
```
## テスト命名
バッククォートで囲んだ説明的な名前を使用する:
```kotlin
@Test
fun `search with empty query returns all items`() = runTest { }
@Test
fun `delete item emits updated list without deleted item`() = runTest { }
```
## テストの構成
```
src/
├── commonTest/kotlin/ # 共有テスト(ViewModel、UseCase、Repository
├── androidUnitTest/kotlin/ # Android ユニットテスト(JUnit
├── androidInstrumentedTest/kotlin/ # インストルメンテッドテスト(Room、UI)
└── iosTest/kotlin/ # iOS 固有のテスト
```
最低限のテストカバレッジ: すべての機能に対して ViewModel + UseCase。