Add Database class unit test

src/Core.Tests/DatabaseTests.cs

@@ -0,0 +1,86 @@
+using System.Data.SQLite;
+using Dapper;
+using OCES.Resonance.Core;
+
+namespace Core.Tests;
+
+public class DatabaseTests
+{
+    static string NewDbName() => $"test_{Guid.NewGuid():N}";
+
+    [Fact]
+    public void InitializeDatabase_ShouldCreateAudioFilesTable()
+    {
+        string dbName = NewDbName();
+        string dbPath = $"{dbName}.rdb";
+
+        try
+        {
+            // Act
+            Database.InitializeDatabase(dbName);
+
+            // Assert — 用自己的 SQLite 连接验证
+            using var conn = new SQLiteConnection($"Data Source={dbPath};Version=3;");
+            conn.Open();
+
+            // 1. 表存在
+            var tableCount = conn.ExecuteScalar<int>(
+                "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='audio_files';");
+            Assert.Equal(1, tableCount);
+
+            // 2. 核心列存在（抽查）
+            var columns = conn.Query<string>(
+                "SELECT name FROM pragma_table_info('audio_files') ORDER BY cid;").ToHashSet();
+            Assert.Contains("id", columns);
+            Assert.Contains("unique_id", columns);
+            Assert.Contains("md5", columns);
+            Assert.Contains("path", columns);
+            Assert.Contains("filename", columns);
+            Assert.Contains("duration", columns);
+            Assert.Contains("bpm", columns);
+            Assert.Contains("description", columns);
+
+            // 3. 索引存在
+            var indexes = conn.Query<string>(
+                "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='audio_files';")
+                .ToHashSet();
+            Assert.Contains("idx_file_name", indexes);
+            Assert.Contains("idx_md5", indexes);
+            Assert.Contains("idx_path", indexes);
+            Assert.Contains("idx_unique_id", indexes);
+            Assert.Contains("idx_description", indexes);
+        }
+        finally
+        {
+            if (File.Exists(dbPath)) File.Delete(dbPath);
+        }
+    }
+
+    [Fact]
+    public void InitializeDatabase_ShouldBeIdempotent()
+    {
+        string dbName = NewDbName();
+        string dbPath = $"{dbName}.rdb";
+
+        try
+        {
+            // Act — 连续调用两次
+            Database.InitializeDatabase(dbName);
+            var exception = Record.Exception(() => Database.InitializeDatabase(dbName));
+
+            // Assert — 不应抛出异常
+            Assert.Null(exception);
+
+            // 表仍然只有一个
+            using var conn = new SQLiteConnection($"Data Source={dbPath};Version=3;");
+            conn.Open();
+            var tableCount = conn.ExecuteScalar<int>(
+                "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='audio_files';");
+            Assert.Equal(1, tableCount);
+        }
+        finally
+        {
+            if (File.Exists(dbPath)) File.Delete(dbPath);
+        }
+    }
+}

src/Core/Database.cs

@@ -11,7 +11,7 @@ public static class Database
     /// </summary>
     /// <param name="dbName">数据库名称（不含扩展名）</param>
     /// <returns>数据库连接</returns>
-    static IDbConnection GetConnection(string dbName = "default")
+    internal static IDbConnection GetConnection(string dbName = "default")
     {
         string connectionString = $"Data Source={dbName}.rdb;Version=3;";
         return new SQLiteConnection(connectionString);
@@ -20,7 +20,7 @@ public static class Database
     /// <summary>
     /// 初始化数据库表结构
     /// </summary>
-    public static void InitializeDatabase()
+    public static void InitializeDatabase(string databaseName = "default")
     {
         using var connection = GetConnection();
         connection.Open();

src/Resonance.sln.DotSettings.user

@@ -14,5 +14,6 @@
     <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.AudioMetadataReaderTest.ReadMetadata_ShoudThrow_FileNotFoundException</TestId>
     <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.AudioMetadataReaderTest.ReadMetadata_ShouldThrow_FileNotFoundException</TestId>
     <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.AudioMetadataReaderTest</TestId>
+    <TestId>xUnit::24F92458-FB39-44BE-A32F-41275183AF1B::net10.0::Core.Tests.DatabaseTests.InitializeDatabase_ShouldCreateAudioFilesTable</TestId>
   </TestAncestor>
 &lt;/SessionState&gt;</s:String></wpf:ResourceDictionary>