Fix BaseItemKind conversion for PlaylistsFolder

Return the correct ClientTypeName to allow Enum Parse
Added dynamic unit tests to ensure all BaseItem concrete descend

tests/Jellyfin.Server.Tests/BaseItemKindTests.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using MediaBrowser.Controller.Entities;
+using Xunit;
+
+namespace Jellyfin.Server.Tests
+{
+    public class BaseItemKindTests
+    {
+        [Theory]
+        [ClassData(typeof(GetBaseItemDescendant))]
+        public void BaseKindEnumTest(Type baseItemDescendantType)
+        {
+            var defaultConstructor = baseItemDescendantType.GetConstructor(Type.EmptyTypes);
+
+            Assert.NotNull(defaultConstructor);
+            if (defaultConstructor != null)
+            {
+                var instance = (BaseItem)defaultConstructor.Invoke(null);
+                var exception = Record.Exception(() => instance.GetBaseItemKind());
+                Assert.Null(exception);
+            }
+        }
+
+        private static bool IsProjectAssemblyName(string? name)
+        {
+            if (name == null)
+            {
+                return false;
+            }
+
+            return name.Contains("Jellyfin", StringComparison.InvariantCulture)
+                || name.Contains("Emby", StringComparison.InvariantCulture)
+                || name.Contains("MediaBrowser", StringComparison.InvariantCulture)
+                || name.Contains("RSSDP", StringComparison.InvariantCulture);
+        }
+
+        private class GetBaseItemDescendant : IEnumerable<object?[]>
+        {
+            public IEnumerator<object?[]> GetEnumerator()
+            {
+                var projectAssemblies = AppDomain.CurrentDomain.GetAssemblies()
+                    .Where(x => IsProjectAssemblyName(x.FullName));
+
+                foreach (var projectAssembly in projectAssemblies)
+                {
+                    var baseItemDescendantTypes = projectAssembly.GetTypes()
+                         .Where(targetType => targetType.IsClass && !targetType.IsAbstract && targetType.IsSubclassOf(typeof(BaseItem)));
+
+                    foreach (var descendantType in baseItemDescendantTypes)
+                    {
+                        yield return new object?[] { descendantType };
+                    }
+                }
+            }
+
+            IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        }
+    }
+}

tests/Jellyfin.Server.Tests/Jellyfin.Server.Tests.csproj

@@ -0,0 +1,48 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!-- ProjectGuid is only included as a requirement for SonarQube analysis -->
+  <PropertyGroup>
+    <ProjectGuid>{0FD15BDA-FA63-4FFF-9E6B-781F20DA88D9}</ProjectGuid>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <Nullable>enable</Nullable>
+    <RootNamespace>Jellyfin.Server.Tests</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="Test Data\**\*.*">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoFixture" Version="4.15.0" />
+    <PackageReference Include="AutoFixture.AutoMoq" Version="4.15.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+    <PackageReference Include="Moq" Version="4.16.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+  </ItemGroup>
+
+  <!-- Code Analyzers -->
+  <ItemGroup Condition=" '$(Configuration)' == 'Debug' ">
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8" PrivateAssets="All" />
+    <PackageReference Include="SerilogAnalyzer" Version="0.15.0" PrivateAssets="All" />
+    <PackageReference Include="StyleCop.Analyzers" Version="1.1.118" PrivateAssets="All" />
+    <PackageReference Include="SmartAnalyzers.MultithreadingAnalyzer" Version="1.1.31" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Jellyfin.Server\Jellyfin.Server.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+    <CodeAnalysisRuleSet>../jellyfin-tests.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+
+</Project>