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---
paths:
- "**/*.fs"
- "**/*.fsx"
- "**/*.fsproj"
---
# F# テスト
> このファイルは [common/testing.md](../common/testing.md) を F# 固有のコンテンツで拡張します。
## テストフレームワーク
- F# フレンドリーなアサーションのために **xUnit****FsUnit.xUnit** を優先する
- 明確な失敗メッセージを持つクォーテーションベースのアサーションには **Unquote** を使用する
- プロパティベーステストには **FsCheck.xUnit** を使用する
- 依存関係のモックには **NSubstitute** または関数スタブを使用する
- インテグレーションテストで実際のインフラが必要な場合は **Testcontainers** を使用する
## テストの構成
- `tests/` 配下に `src/` の構造を反映させる
- ユニット、インテグレーション、エンドツーエンドのカバレッジを明確に分離する
- 実装の詳細ではなく、振る舞いでテストに名前を付ける
```fsharp
open Xunit
open Swensen.Unquote
[<Fact>]
let ``リクエストが有効な場合、PlaceOrder は成功を返す`` () =
let request = { CustomerId = "cust-123"; Items = [ validItem ] }
let result = OrderService.placeOrder request
test <@ Result.isOk result @>
[<Fact>]
let ``アイテムが空の場合、PlaceOrder はエラーを返す`` () =
let request = { CustomerId = "cust-123"; Items = [] }
let result = OrderService.placeOrder request
test <@ Result.isError result @>
```
## FsCheck を使ったプロパティベーステスト
```fsharp
open FsCheck.Xunit
[<Property>]
let ``注文合計が負になることはない`` (items: OrderItem list) =
let total = Order.calculateTotal items
total >= 0m
```
## ASP.NET Core インテグレーションテスト
- API インテグレーションカバレッジには `WebApplicationFactory<TEntryPoint>` を使用する
- ミドルウェアをバイパスするのではなく、HTTP を通じて認証、バリデーション、シリアライゼーションをテストする
## カバレッジ
- 80%以上の行カバレッジを目標とする
- ドメインロジック、バリデーション、認証、失敗パスのカバレッジに重点を置く
- 利用可能な場合はカバレッジ収集を有効にして CI で `dotnet test` を実行する