Added tests

Tests/Musify.Application.Tests/Infrastructure/TestDatabase.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage;
+using Musify.Domain.Entities;
+using AppIDatabase = Musify.Application.Contracts.IDatabase;
+using IDatabaseTransaction = Musify.Application.Contracts.IDatabaseTransaction;
+
+namespace Musify.Application.Tests.Infrastructure;
+
+public sealed class TestDatabase(DbContextOptions<TestDatabase> options) : DbContext(options), AppIDatabase
+{
+    public DbSet<User> Users => Set<User>();
+
+    public DbSet<Track> Tracks => Set<Track>();
+
+    public DbSet<PlayList> PlayLists => Set<PlayList>();
+
+    public DbSet<UserHasTrack> UserHasTracks => Set<UserHasTrack>();
+
+    public DbSet<PlayListHasTrack> PlayListHasTracks => Set<PlayListHasTrack>();
+
+    public DbSet<Upload> Uploads => Set<Upload>();
+
+    public DbSet<UploadIntent> UploadIntents => Set<UploadIntent>();
+
+    public async Task<IDatabaseTransaction> BeginTransactionAsync(
+        System.Data.IsolationLevel isolationLevel, CancellationToken cancellationToken)
+    {
+        var transaction = await Database.BeginTransactionAsync(isolationLevel, cancellationToken);
+        return new TestDatabaseTransaction(transaction);
+    }
+
+    private sealed class TestDatabaseTransaction(IDbContextTransaction inner) : IDatabaseTransaction
+    {
+        public Task CommitAsync(CancellationToken cancellationToken = default) =>
+            inner.CommitAsync(cancellationToken);
+
+        public ValueTask DisposeAsync() => inner.DisposeAsync();
+    }
+}