Initial

tests/ClaudeMailbox.Tests/MigrationTests.cs

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+using ClaudeMailbox.Data;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeMailbox.Tests;
+
+public sealed class MigrationTests
+{
+    [Fact]
+    public async Task EnsureReady_Creates_Schema_And_Is_Idempotent()
+    {
+        var dbPath = Path.Combine(Path.GetTempPath(), $"claude-mailbox-migtest-{Guid.NewGuid():N}.db");
+        try
+        {
+            using (var ctx = NewCtx(dbPath))
+                MailboxDbContext.EnsureReady(ctx);
+
+            // Second call must not throw.
+            using (var ctx = NewCtx(dbPath))
+                MailboxDbContext.EnsureReady(ctx);
+
+            // Verify tables exist.
+            await using var conn = new SqliteConnection($"Data Source={dbPath}");
+            await conn.OpenAsync();
+
+            var tables = new List<string>();
+            using (var cmd = conn.CreateCommand())
+            {
+                cmd.CommandText = "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name;";
+                await using var reader = await cmd.ExecuteReaderAsync();
+                while (await reader.ReadAsync())
+                    tables.Add(reader.GetString(0));
+            }
+            Assert.Contains("mailboxes", tables);
+            Assert.Contains("messages", tables);
+
+            // Verify the expected index exists.
+            string? index;
+            using (var cmd = conn.CreateCommand())
+            {
+                cmd.CommandText = "SELECT name FROM sqlite_master WHERE type='index' AND name='ix_messages_to_delivered';";
+                index = await cmd.ExecuteScalarAsync() as string;
+            }
+            Assert.Equal("ix_messages_to_delivered", index);
+        }
+        finally
+        {
+            SqliteConnection.ClearAllPools();
+            foreach (var ext in new[] { "", "-wal", "-shm" })
+            {
+                var p = dbPath + ext;
+                if (File.Exists(p))
+                {
+                    try { File.Delete(p); } catch { }
+                }
+            }
+        }
+    }
+
+    private static MailboxDbContext NewCtx(string path)
+    {
+        var opts = new DbContextOptionsBuilder<MailboxDbContext>()
+            .UseSqlite($"Data Source={path}")
+            .Options;
+        return new MailboxDbContext(opts);
+    }
+}