Updated playlist model class. Added playlist tests.

Harmonia.Tests/Harmonia.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="Shouldly" Version="4.3.0" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Harmonia.Core\Harmonia.Core.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>

Harmonia.Tests/PlaylistTests.cs

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+using Harmonia.Core.Models;
+using Shouldly;
+using System.ComponentModel;
+
+namespace Harmonia.Tests;
+
+public class PlaylistTests
+{
+    [Fact]
+    public void Add_Songs()
+    {
+        Playlist playlist = new("Test");
+
+        Song[] songs =
+        [
+            new Song() { FileName = "Song1.mp3" },
+            new Song() { FileName = "Song2.mp3" },
+            new Song() { FileName = "Song3.mp3" }
+        ];
+
+        playlist.AddSongs(songs);
+
+        playlist.Songs.Count.ShouldBe(3);
+
+        Song song = new() { FileName = "Song4.mp3" };
+        playlist.AddSong(song);
+
+        playlist.Songs.Count.ShouldBe(4);
+        playlist.Songs[3].Song.FileName.ShouldBe("Song4.mp3");
+
+        Song song2 = new() { FileName = "Song5.mp3" };
+        playlist.AddSong(song2, 1);
+
+        playlist.Songs.Count.ShouldBe(5);
+        playlist.Songs[1].Song.FileName.ShouldBe("Song5.mp3");
+    }
+
+    [Fact]
+    public void Sort_Songs()
+    {
+        Playlist playlist = new("Test");
+
+        Song[] songs =
+        [
+            new Song() { FileName = "Song1.mp3", Album = "Album 2", TrackNumber = 2 },
+            new Song() { FileName = "Song2.mp3", Album = "Album 1", TrackNumber = 2 },
+            new Song() { FileName = "Song3.mp3", Album = "Album 2", TrackNumber = 1 },
+            new Song() { FileName = "Song4.mp3", Album = "Album 1", TrackNumber = 1 },
+            new Song() { FileName = "Song5.mp3", Album = "Album 2", TrackNumber = 3 },
+        ];
+
+        playlist.AddSongs(songs);
+
+        SortOption[] sortOptions =
+        [
+            new("Album", ListSortDirection.Ascending),
+            new("TrackNumber", ListSortDirection.Ascending)
+        ];
+
+        playlist.SortSongs([.. playlist.Songs], sortOptions);
+
+        string[] expectedSortedFileNames =
+        [
+            "Song4.mp3",
+            "Song2.mp3",
+            "Song3.mp3",
+            "Song1.mp3",
+            "Song5.mp3"
+        ];
+
+        playlist.Songs.Select(x => x.Song.FileName).ToArray()
+            .ShouldBeEquivalentTo(expectedSortedFileNames);
+    }
+
+    [Fact]
+    public void Remove_Songs()
+    {
+        Playlist playlist = new("Test");
+
+        Song[] songs =
+        [
+            new Song() { FileName = "Song1.mp3" },
+            new Song() { FileName = "Song2.mp3" },
+            new Song() { FileName = "Song3.mp3" }
+        ];
+
+        playlist.AddSongs(songs);
+
+        playlist.RemoveSong(1);
+
+        string[] expectedFileNames =
+        [
+            "Song1.mp3",
+            "Song3.mp3"
+        ];
+
+        playlist.Songs.Select(x => x.Song.FileName).ToArray()
+            .ShouldBeEquivalentTo(expectedFileNames);
+    }
+
+    [Fact]
+    public void Lock_Playlist()
+    {
+        Playlist playlist = new("Test");
+
+        Song[] songs =
+        [
+            new Song() { FileName = "Song1.mp3" },
+            new Song() { FileName = "Song2.mp3" },
+            new Song() { FileName = "Song3.mp3" }
+        ];
+
+        playlist.AddSongs(songs);
+
+        playlist.IsLocked = true;
+
+        Song song = new() { FileName = "Song4.mp3" };
+        playlist.AddSong(song);
+
+        playlist.Songs.Count.ShouldBe(3);
+
+        playlist.RemoveSong(0);
+
+        playlist.Songs.Count.ShouldBe(3);
+    }
+}