diff --git a/src/HUDMerger/Models/Dependencies.cs b/src/HUDMerger/Models/Dependencies.cs
index a11e2b0..284cdbe 100644
--- a/src/HUDMerger/Models/Dependencies.cs
+++ b/src/HUDMerger/Models/Dependencies.cs
@@ -47,7 +47,7 @@ public void UnionWith(Dependencies other)
 		Files.UnionWith(other.Files);
 	}
 
-	public void Add(HUDFileReaderService reader, HUD hud)
+	public void Add(IHUDFileReaderService reader, HUD hud)
 	{
 		reader.Require(Files.Select((file) => (hud, file, FileType.VDF)));
 
@@ -57,7 +57,7 @@ public void Add(HUDFileReaderService reader, HUD hud)
 		}
 	}
 
-	public void Add(HUDFileReaderService reader, HUD hud, string relativePath)
+	public void Add(IHUDFileReaderService reader, HUD hud, string relativePath)
 	{
 		try
 		{
diff --git a/src/HUDMerger/Models/HUD.cs b/src/HUDMerger/Models/HUD.cs
index 671ba59..5f914cc 100644
--- a/src/HUDMerger/Models/HUD.cs
+++ b/src/HUDMerger/Models/HUD.cs
@@ -122,9 +122,9 @@ public static void Merge(HUD source, HUD target, HUDPanel[] panels)
 		Dependencies dependencies = new(panels.Select((panel) => panel.Dependencies).OfType<Dependencies>());
 		dependencies.Files.UnionWith(panels.Select((panel) => panel.Main).Where((main) => !string.IsNullOrEmpty(main)));
 
-		HUDFileReaderService reader = new();
+		IHUDFileReaderService reader = new HUDFileReaderService();
 
-		Func<HUDFileReaderService, HUD, HUD, Dependencies, Action<HUDFileWriterService>?>[] actions =
+		Func<IHUDFileReaderService, HUD, HUD, Dependencies, Action<IHUDFileWriterService>?>[] actions =
 		[
 			AddDependencies,
 			MergeHUDLayout,
@@ -138,14 +138,14 @@ public static void Merge(HUD source, HUD target, HUDPanel[] panels)
 			CopyFiles
 		];
 
-		List<Action<HUDFileWriterService>> commitActions = [];
+		List<Action<IHUDFileWriterService>> commitActions = [];
 		List<Exception> exceptions = [];
 
-		foreach (Func<HUDFileReaderService, HUD, HUD, Dependencies, Action<HUDFileWriterService>?> action in actions)
+		foreach (Func<IHUDFileReaderService, HUD, HUD, Dependencies, Action<IHUDFileWriterService>?> action in actions)
 		{
 			try
 			{
-				Action<HUDFileWriterService>? result = action(reader, source, target, dependencies);
+				Action<IHUDFileWriterService>? result = action(reader, source, target, dependencies);
 				if (result != null)
 				{
 					commitActions.Add(result);
@@ -170,21 +170,21 @@ public static void Merge(HUD source, HUD target, HUDPanel[] panels)
 			]));
 		}
 
-		HUDFileWriterService writer = new(target.FolderPath);
+		IHUDFileWriterService writer = new HUDFileWriterService(target.FolderPath);
 
-		foreach (Action<HUDFileWriterService> action in commitActions)
+		foreach (Action<IHUDFileWriterService> action in commitActions)
 		{
 			action(writer);
 		}
 	}
 
-	private static Action<HUDFileWriterService>? AddDependencies(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? AddDependencies(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		dependencies.Add(reader, source);
 		return null;
 	}
 
-	private static Action<HUDFileWriterService>? MergeHUDLayout(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeHUDLayout(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		if (dependencies.HUDLayout.Count == 0)
 		{
@@ -369,7 +369,7 @@ void RemoveBaseHUDLayoutEntries(string folderPath, IEnumerable<string> baseFiles
 		};
 	}
 
-	private static Action<HUDFileWriterService>? MergeHUDAnimations(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeHUDAnimations(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		if (dependencies.Events.Count == 0)
 		{
@@ -492,7 +492,7 @@ bool SourceHUDAnimationsFileExists(KeyValue kv)
 		};
 	}
 
-	private static Action<HUDFileWriterService>? MergeClientScheme(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeClientScheme(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		if (!dependencies.ClientScheme.Any())
 		{
@@ -721,7 +721,7 @@ If the value is a string select the string value
 		};
 	}
 
-	private static Action<HUDFileWriterService>? MergeSourceScheme(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeSourceScheme(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		if (!dependencies.SourceScheme.Any())
 		{
@@ -955,7 +955,7 @@ void RemoveBaseSchemeValues(string folderPath, IEnumerable<string> baseFiles)
 		};
 	}
 
-	private static Action<HUDFileWriterService>? MergeLanguageTokens(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeLanguageTokens(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		if (dependencies.LanguageTokens.Count == 0)
 		{
@@ -982,7 +982,7 @@ void RemoveBaseSchemeValues(string folderPath, IEnumerable<string> baseFiles)
 
 		reader.Require(required);
 
-		static (KeyValues Root, KeyValues Tokens) LoadLanguageFile(HUDFileReaderService reader, HUD hud, string language)
+		static (KeyValues Root, KeyValues Tokens) LoadLanguageFile(IHUDFileReaderService reader, HUD hud, string language)
 		{
 			KeyValues keyValues = reader.ReadKeyValues(hud, $"resource\\chat_{language}.txt");
 			KeyValues languageFileHeader = keyValues.Header("lang");
@@ -1078,7 +1078,7 @@ void RemoveBaseSchemeValues(string folderPath, IEnumerable<string> baseFiles)
 		};
 	}
 
-	private static Action<HUDFileWriterService>? MergeImages(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeImages(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		reader.Require([
 			..dependencies.Images.Select((image) => (source, $"{image}.vmt", FileType.VDF)  ),
@@ -1105,13 +1105,13 @@ void RemoveBaseSchemeValues(string folderPath, IEnumerable<string> baseFiles)
 		return null;
 	}
 
-	private static Action<HUDFileWriterService>? MergeAudio(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeAudio(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		dependencies.Files.UnionWith(dependencies.Audio);
 		return null;
 	}
 
-	private static Action<HUDFileWriterService>? MergeInfoVDF(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? MergeInfoVDF(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		reader.Require([
 			(target, "info.vdf", FileType.VDF)
@@ -1140,7 +1140,7 @@ void RemoveBaseSchemeValues(string folderPath, IEnumerable<string> baseFiles)
 		};
 	}
 
-	private static Action<HUDFileWriterService>? CopyFiles(HUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
+	private static Action<IHUDFileWriterService>? CopyFiles(IHUDFileReaderService reader, HUD source, HUD target, Dependencies dependencies)
 	{
 		return (writer) =>
 		{
diff --git a/src/HUDMerger/Models/HUDLayout.cs b/src/HUDMerger/Models/HUDLayout.cs
index 7d46589..36bbe5d 100644
--- a/src/HUDMerger/Models/HUDLayout.cs
+++ b/src/HUDMerger/Models/HUDLayout.cs
@@ -17,9 +17,9 @@ public HUDLayout()
 	{
 	}
 
-	public HUDLayout(HUDFileReaderService reader, HUD hud)
+	public HUDLayout(IHUDFileReaderService reader, HUD hud)
 	{
-		static Dictionary<KeyValue, HashSet<KeyValue>>? ReadBaseFile(HUDFileReaderService reader, HUD hud, string relativePath)
+		static Dictionary<KeyValue, HashSet<KeyValue>>? ReadBaseFile(IHUDFileReaderService reader, HUD hud, string relativePath)
 		{
 			KeyValues? keyValues = reader.TryReadKeyValues(hud, relativePath);
 			if (keyValues == null) return null;
diff --git a/src/HUDMerger/Models/Scheme/ClientScheme.cs b/src/HUDMerger/Models/Scheme/ClientScheme.cs
index 48d8acc..775dbc7 100644
--- a/src/HUDMerger/Models/Scheme/ClientScheme.cs
+++ b/src/HUDMerger/Models/Scheme/ClientScheme.cs
@@ -10,11 +10,11 @@ public ClientScheme() : base()
 	{
 	}
 
-	public ClientScheme(HUDFileReaderService reader, HUD hud, string relativePath) : base(reader, hud, relativePath)
+	public ClientScheme(IHUDFileReaderService reader, HUD hud, string relativePath) : base(reader, hud, relativePath)
 	{
 	}
 
-	public ClientScheme(HUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues) : base(reader, hud, relativePath, keyValues)
+	public ClientScheme(IHUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues) : base(reader, hud, relativePath, keyValues)
 	{
 	}
 }
diff --git a/src/HUDMerger/Models/Scheme/SchemeBase.cs b/src/HUDMerger/Models/Scheme/SchemeBase.cs
index 81353f9..c0b13d3 100644
--- a/src/HUDMerger/Models/Scheme/SchemeBase.cs
+++ b/src/HUDMerger/Models/Scheme/SchemeBase.cs
@@ -29,13 +29,13 @@ public SchemeBase()
 	{
 	}
 
-	public SchemeBase(HUDFileReaderService reader, HUD hud, string relativePath) : this(reader, hud, relativePath, reader.ReadKeyValues(hud, relativePath))
+	public SchemeBase(IHUDFileReaderService reader, HUD hud, string relativePath) : this(reader, hud, relativePath, reader.ReadKeyValues(hud, relativePath))
 	{
 	}
 
-	public SchemeBase(HUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues)
+	public SchemeBase(IHUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues)
 	{
-		static SchemeFile? ReadBaseFile(HUDFileReaderService reader, HUD hud, string relativePath)
+		static SchemeFile? ReadBaseFile(IHUDFileReaderService reader, HUD hud, string relativePath)
 		{
 			KeyValues? keyValues = reader.TryReadKeyValues(hud, relativePath);
 			if (keyValues == null) return null;
diff --git a/src/HUDMerger/Models/Scheme/SourceScheme.cs b/src/HUDMerger/Models/Scheme/SourceScheme.cs
index 764876e..9cd2ebb 100644
--- a/src/HUDMerger/Models/Scheme/SourceScheme.cs
+++ b/src/HUDMerger/Models/Scheme/SourceScheme.cs
@@ -10,11 +10,11 @@ public SourceScheme() : base()
 	{
 	}
 
-	public SourceScheme(HUDFileReaderService reader, HUD hud, string relativePath) : base(reader, hud, relativePath)
+	public SourceScheme(IHUDFileReaderService reader, HUD hud, string relativePath) : base(reader, hud, relativePath)
 	{
 	}
 
-	public SourceScheme(HUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues) : base(reader, hud, relativePath, keyValues)
+	public SourceScheme(IHUDFileReaderService reader, HUD hud, string relativePath, KeyValues keyValues) : base(reader, hud, relativePath, keyValues)
 	{
 	}
 }
diff --git a/src/HUDMerger/Services/HUDFileReaderService.cs b/src/HUDMerger/Services/HUDFileReaderService.cs
index b220905..4af7ee8 100644
--- a/src/HUDMerger/Services/HUDFileReaderService.cs
+++ b/src/HUDMerger/Services/HUDFileReaderService.cs
@@ -21,7 +21,7 @@ public enum FileType : byte
 	HUDAnimations = 1
 }
 
-public partial class HUDFileReaderService
+public partial class HUDFileReaderService : IHUDFileReaderService
 {
 	private readonly Lazy<VPK> TF2MiscDirVPK = new(() => new(Path.Join(((App)Application.Current).Settings.Value.TeamFortress2Folder, "tf\\tf2_misc_dir.vpk")));
 	private readonly Lazy<VPK> PlatformMiscDirVPK = new(() => new(Path.Join(((App)Application.Current).Settings.Value.TeamFortress2Folder, "platform\\platform_misc_dir.vpk")));
diff --git a/src/HUDMerger/Services/HUDFileWriterService.cs b/src/HUDMerger/Services/HUDFileWriterService.cs
index a4626f7..35c3913 100644
--- a/src/HUDMerger/Services/HUDFileWriterService.cs
+++ b/src/HUDMerger/Services/HUDFileWriterService.cs
@@ -9,7 +9,7 @@
 
 namespace HUDMerger.Services;
 
-public class HUDFileWriterService(string folderPath)
+public class HUDFileWriterService(string folderPath) : IHUDFileWriterService
 {
 	private void Write(string relativePath, string text, Encoding? encoding)
 	{
diff --git a/src/HUDMerger/Services/IHUDFileReaderService.cs b/src/HUDMerger/Services/IHUDFileReaderService.cs
new file mode 100644
index 0000000..f8a47c5
--- /dev/null
+++ b/src/HUDMerger/Services/IHUDFileReaderService.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using HUDAnimations.Models;
+using HUDMerger.Models;
+using VDF.Models;
+
+namespace HUDMerger.Services;
+
+public interface IHUDFileReaderService
+{
+	public void Require(IEnumerable<(HUD hud, string relativePath, FileType type)> filePaths);
+
+	public KeyValues ReadKeyValues(HUD hud, string relativePath);
+	public KeyValues? TryReadKeyValues(HUD hud, string relativePath);
+
+	public HUDAnimationsFile ReadHUDAnimations(HUD hud, string relativePath);
+	public HUDAnimationsFile? TryReadHUDAnimations(HUD hud, string relativePath);
+}
diff --git a/src/HUDMerger/Services/IHUDFileWriterService.cs b/src/HUDMerger/Services/IHUDFileWriterService.cs
new file mode 100644
index 0000000..a405daf
--- /dev/null
+++ b/src/HUDMerger/Services/IHUDFileWriterService.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Text;
+using HUDAnimations.Models;
+using HUDMerger.Models;
+using VDF.Models;
+
+namespace HUDMerger.Services;
+
+public interface IHUDFileWriterService
+{
+	public void Write(string relativePath, KeyValues keyValues, Encoding? encoding = default);
+	public void Write(string relativePath, HUDAnimationsFile keyValues, Encoding? encoding = default);
+	public void Copy(HUD source, string relativePath);
+}