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paths
paths
**/*.cs
**/*.csx
**/*.csproj

C# テスト

このファイルは 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
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