Separate responsibilities: start-listening command, API-side JSON converters, bulk track endpoints, mix kinds

backend/Tests/Musify.Api.Tests/Endpoints/GenreEndpointsTests.cs

@@ -40,7 +40,6 @@ public sealed class GenreEndpointsTests(ApiTestFixture fixture)
             tag.TrackId = track.Id;
         database.Users.Add(owner);
         database.Tracks.Add(track);
-        database.UserHasTracks.Add(new UserHasTrack { UserId = owner.Id, TrackId = track.Id });
         await database.SaveChangesAsync(TestContext.Current.CancellationToken);
         return title;
     }

backend/Tests/Musify.Api.Tests/Validators/TrackRequestValidatorTests.cs

@@ -0,0 +1,48 @@
+using Musify.Api.DataTransferObjects.Tracks;
+using Musify.Api.Validators.Tracks;
+using Musify.Domain.ValueObjects;
+using Xunit;
+
+namespace Musify.Api.Tests.Validators;
+
+public sealed class TrackRequestValidatorTests
+{
+    [Fact]
+    public void CreateTrack_ValidRequest_Passes()
+    {
+        var request = new CreateTrackRequest("Song", Guid.NewGuid(), Guid.NewGuid(), [Genre.Pop, Genre.Rock]);
+
+        Assert.True(new CreateTrackRequestValidator().Validate(request).IsValid);
+    }
+
+    [Fact]
+    public void CreateTrack_NoTags_Fails()
+    {
+        var request = new CreateTrackRequest("Song", Guid.NewGuid(), Guid.NewGuid(), []);
+
+        Assert.False(new CreateTrackRequestValidator().Validate(request).IsValid);
+    }
+
+    [Fact]
+    public void CreateTrack_IncompatibleTags_Fails()
+    {
+        var request = new CreateTrackRequest("Song", Guid.NewGuid(), Guid.NewGuid(), [Genre.Classical, Genre.Metal]);
+
+        Assert.False(new CreateTrackRequestValidator().Validate(request).IsValid);
+    }
+
+    [Theory]
+    [InlineData(-1)]
+    [InlineData(double.NaN)]
+    [InlineData(double.PositiveInfinity)]
+    public void RecordListeningProgress_InvalidSeconds_Fails(double seconds)
+    {
+        Assert.False(new RecordListeningProgressRequestValidator().Validate(new RecordListeningProgressRequest(seconds)).IsValid);
+    }
+
+    [Fact]
+    public void RecordListeningProgress_ZeroSeconds_Passes()
+    {
+        Assert.True(new RecordListeningProgressRequestValidator().Validate(new RecordListeningProgressRequest(0)).IsValid);
+    }
+}