Add 404 response to MarkPlayedItem/MarkUnplayedItem (#9211)

Fixes https://github.com/jellyfin/jellyfin/issues/9120

tests/Jellyfin.Server.Integration.Tests/Controllers/PlaystateControllerTests.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Xunit;
+using Xunit.Priority;
+
+namespace Jellyfin.Server.Integration.Tests.Controllers;
+
+[TestCaseOrderer(PriorityOrderer.Name, PriorityOrderer.Assembly)]
+public class PlaystateControllerTests : IClassFixture<JellyfinApplicationFactory>
+{
+    private readonly JellyfinApplicationFactory _factory;
+    private static readonly Guid _testUserId = Guid.NewGuid();
+    private static readonly Guid _testItemId = Guid.NewGuid();
+    private static string? _accessToken;
+
+    public PlaystateControllerTests(JellyfinApplicationFactory factory)
+    {
+        _factory = factory;
+    }
+
+    private Task<HttpResponseMessage> DeleteUserPlayedItems(HttpClient httpClient, Guid userId, Guid itemId)
+        => httpClient.DeleteAsync($"Users/{userId}/PlayedItems/{itemId}");
+
+    private Task<HttpResponseMessage> PostUserPlayedItems(HttpClient httpClient, Guid userId, Guid itemId)
+        => httpClient.PostAsync($"Users/{userId}/PlayedItems/{itemId}", null);
+
+    [Fact]
+    [Priority(0)]
+    public async Task DeleteMarkUnplayedItem_DoesNotExist_NotFound()
+    {
+        var client = _factory.CreateClient();
+        client.DefaultRequestHeaders.AddAuthHeader(_accessToken ??= await AuthHelper.CompleteStartupAsync(client).ConfigureAwait(false));
+
+        using var response = await DeleteUserPlayedItems(client, _testUserId, _testItemId).ConfigureAwait(false);
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+    }
+
+    [Fact]
+    [Priority(0)]
+    public async Task PostMarkPlayedItem_DoesNotExist_NotFound()
+    {
+        var client = _factory.CreateClient();
+        client.DefaultRequestHeaders.AddAuthHeader(_accessToken ??= await AuthHelper.CompleteStartupAsync(client).ConfigureAwait(false));
+
+        using var response = await PostUserPlayedItems(client, _testUserId, _testItemId).ConfigureAwait(false);
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+    }
+}