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---
paths:
- "**/*.cs"
- "**/*.csx"
- "**/*.csproj"
---
# C# テスト
> このファイルは [common/testing.md](../common/testing.md) を C# 固有のコンテンツで拡張します。
## テストフレームワーク
- ユニットテストと統合テストには **xUnit** を優先する
- 読みやすいアサーションには **FluentAssertions** を使用する
- 依存関係のモックには **Moq** または **NSubstitute** を使用する
- 統合テストで実際のインフラが必要な場合は **Testcontainers** を使用する
## テスト構成
- `tests/` 以下で `src/` 構造を反映させる
- ユニット、統合、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動作でテストに名前を付ける
```csharp
public sealed class OrderServiceTests
{
[Fact]
public async Task FindByIdAsync_ReturnsOrder_WhenOrderExists()
{
// Arrange
// Act
// Assert
}
}
```
## ASP.NET Core 統合テスト
- API 統合カバレッジには `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
- 行カバレッジ 80% 以上を目標とする
- ドメインロジック、バリデーション、認証、失敗パスにカバレッジを集中させる
- 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