diff --git a/YmlTransform.sln b/YmlTransform.sln
index d3940df..530b267 100644
--- a/YmlTransform.sln
+++ b/YmlTransform.sln
@@ -1,10 +1,12 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26430.13
+VisualStudioVersion = 15.0.27004.2002
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "YmlTransform", "src\YmlTransform\YmlTransform.csproj", "{00EC6644-0EBF-44A8-8EDF-F73D06787377}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "YmlTransform.Tests", "tests\YmlTransform.Tests\YmlTransform.Tests.csproj", "{BB5287AE-B720-4C65-80B0-15F4EB459BA4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,8 +17,15 @@ Global
 		{00EC6644-0EBF-44A8-8EDF-F73D06787377}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{00EC6644-0EBF-44A8-8EDF-F73D06787377}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{00EC6644-0EBF-44A8-8EDF-F73D06787377}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BB5287AE-B720-4C65-80B0-15F4EB459BA4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BB5287AE-B720-4C65-80B0-15F4EB459BA4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BB5287AE-B720-4C65-80B0-15F4EB459BA4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BB5287AE-B720-4C65-80B0-15F4EB459BA4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7C44AB57-BB9F-4E95-860F-1F96C74B11EB}
+	EndGlobalSection
 EndGlobal
diff --git a/src/YmlTransform/Models/TransformItem.cs b/src/YmlTransform/Models/TransformItem.cs
index 6bf5537..29aae94 100644
--- a/src/YmlTransform/Models/TransformItem.cs
+++ b/src/YmlTransform/Models/TransformItem.cs
@@ -4,34 +4,11 @@ namespace YmlTransform.Models
 {
     class TransformItem
     {
-        /// <summary>
-        /// Path of the item in the tree
-        /// </summary>
         public string Path { get; set; }
-
-        /// <summary>
-        /// The type of the current item
-        /// </summary>
         public string Type { get; set; }
-
-        /// <summary>
-        /// The languages of the item
-        /// </summary>
         public string Languages { get; set; }
-
-        /// <summary>
-        /// The field id
-        /// </summary>
         public Guid FieldId { get; set; }
-
-        /// <summary>
-        /// The value of the item
-        /// </summary>
         public string Value { get; set; }
-
-        /// <summary>
-        /// Hint property aka human readable id
-        /// </summary>
         public string Hint { get; set; }
     }
 }
\ No newline at end of file
diff --git a/src/YmlTransform/Program.cs b/src/YmlTransform/Program.cs
index 0e643eb..ee47c07 100644
--- a/src/YmlTransform/Program.cs
+++ b/src/YmlTransform/Program.cs
@@ -1,14 +1,8 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using Rainbow.Model;
-using Rainbow.Storage.Yaml;
-using YmlTransform.Models;
+using YmlTransform.Models;
 
 namespace YmlTransform
 {
-    static class Program
+    class Program
     {
         static void Main(string[] args)
         {
@@ -16,62 +10,8 @@ static void Main(string[] args)
             var isValid = CommandLine.Parser.Default.ParseArgumentsStrict(args, options);
             if (isValid)
             {
-                var transformation = Newtonsoft.Json.JsonConvert.DeserializeObject<List<TransformItem>>(File.ReadAllText(options.TransformFile));
-
-                Transform(options.Path, transformation, options.Recursive);
-            }
-        }
-
-        private static void Transform(string path, List<TransformItem> transformations, bool recursive)
-        {
-            var files = Directory.GetFiles(path, "*.yml",
-                recursive ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);
-
-            foreach (var file in files)
-            {
-                using (var fs = new FileStream(file, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
-                {
-                    var transformed = false;
-                    var formatter = new YamlSerializationFormatter(null, null);
-                    var item = new ProxyItem(formatter.ReadSerializedItem(fs, Path.GetFileName(file)));
-
-                    foreach (var t in transformations)
-                    {
-                        if (item.Path == t.Path)
-                        {
-                            if (t.Type == "Shared")
-                            {
-                                if (item.SharedFields.FirstOrDefault(a => a.FieldId == t.FieldId) is ProxyFieldValue field)
-                                {
-                                    Console.WriteLine($"Updating file {file} section {t.Type} id {t.FieldId} to {t.Value}");
-                                    field.Value = t.Value;
-                                    transformed = true;
-                                }
-                            }
-                            else if (t.Type == "Languages")
-                            {
-                                if (item.Versions
-                                    .Where(a => t.Languages == "*")
-                                    .SelectMany(a => a.Fields)
-                                    .FirstOrDefault(a => a.FieldId == t.FieldId) is ProxyFieldValue field)
-                                {
-                                    Console.WriteLine($"Updating file {file} section {t.Type} id {t.FieldId} to {t.Value}");
-                                    field.Value = t.Value;
-                                    transformed = true;
-                                }
-                            }
-                        }
-                    }
-
-                    if (transformed)
-                    {
-                        Console.WriteLine($"Transformed: {file}");
-                        fs.SetLength(0);
-                        formatter.WriteSerializedItem(item, fs);
-                    }
-                }
-
+                YmlTransformer.TransformPath(options.Path, options.TransformFile, options.Recursive);
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/YmlTransform/YmlTransform.csproj b/src/YmlTransform/YmlTransform.csproj
index fb5abc8..5d0caa4 100644
--- a/src/YmlTransform/YmlTransform.csproj
+++ b/src/YmlTransform/YmlTransform.csproj
@@ -81,6 +81,7 @@
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Models\TransformItem.cs" />
+    <Compile Include="YmlTransformer.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
diff --git a/src/YmlTransform/YmlTransformer.cs b/src/YmlTransform/YmlTransformer.cs
new file mode 100644
index 0000000..fa132f7
--- /dev/null
+++ b/src/YmlTransform/YmlTransformer.cs
@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Rainbow.Model;
+using Rainbow.Storage.Yaml;
+using YmlTransform.Models;
+
+namespace YmlTransform
+{
+    public static class YmlTransformer
+    {
+        public static void TransformFile(string fileToTransform, string transformFile)
+        {
+            var transformation = GetTransformation(transformFile);
+            TransformSingle(transformation, fileToTransform);
+        }
+
+
+        public static void TransformPath(string path, string transformFile, bool recursive)
+        {
+            var transformations = GetTransformation(transformFile);
+            var files = Directory.GetFiles(path, "*.yml",
+                recursive ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);
+
+            foreach (var file in files)
+            {
+                TransformSingle(transformations, file);
+            }
+        }
+
+        private static List<TransformItem> GetTransformation(string transformFile)
+        {
+            var transformation =
+                Newtonsoft.Json.JsonConvert.DeserializeObject<List<TransformItem>>(File.ReadAllText(transformFile));
+            return transformation;
+        }
+
+        private static void TransformSingle(List<TransformItem> transformations, string file)
+        {
+            using (var fs = new FileStream(file, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
+            {
+                var transformed = false;
+                var formatter = new YamlSerializationFormatter(null, null);
+                var item = new ProxyItem(formatter.ReadSerializedItem(fs, Path.GetFileName(file)));
+
+                foreach (var transform in transformations)
+                {
+                    if (item.Path == transform.Path)
+                    {
+                        if (transform.Type == "Shared")
+                        {
+                            if (item.SharedFields.FirstOrDefault(a => a.FieldId == transform.FieldId) is ProxyFieldValue field)
+                            {
+                                Console.WriteLine(
+                                    $"Updating file {file} section {transform.Type} id {transform.FieldId} to {transform.Value}");
+                                field.Value = transform.Value;
+                                transformed = true;
+                            }
+                        }
+                        else if (transform.Type == "Languages")
+                        {
+                            var fields = item.Versions
+                                .Where(a => transform.Languages == "*")
+                                .SelectMany(a => a.Fields)
+                                .Where(a => a.FieldId == transform.FieldId);
+
+                            foreach (var itemFieldValue in fields)
+                            {
+                                var field = (ProxyFieldValue) itemFieldValue;
+                                Console.WriteLine(
+                                    $"Updating file {file} section {transform.Type} id {transform.FieldId} to {transform.Value}");
+                                field.Value = transform.Value;
+                                transformed = true;
+                            }
+                        }
+                    }
+                }
+
+
+                if (transformed)
+                {
+                    Console.WriteLine($"Transformed: {file}");
+                    fs.SetLength(0);
+                    formatter.WriteSerializedItem(item, fs);
+                }
+            }
+        }
+    }
+}
diff --git a/tests/YmlTransform.Tests/Data/Multi-Language.yml b/tests/YmlTransform.Tests/Data/Multi-Language.yml
new file mode 100644
index 0000000..4337bf5
--- /dev/null
+++ b/tests/YmlTransform.Tests/Data/Multi-Language.yml
@@ -0,0 +1,47 @@
+---
+ID: "2a65abb0-3123-469f-a603-5f3b1804713c"
+Parent: "756fff26-90f2-4889-bace-da656e66b9c1"
+Template: "013bc834-c0f6-4377-924e-0de185abfbe7"
+Path: /sitecore/content/Home/MultiLanguage
+DB: master
+Languages:
+- Language: de
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: "German Field1"
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: "German Field2"
+- Language: en
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: "English Field1"
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: "English Field2"
+- Language: fr
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: "French Field1"
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: "French Field2"
+- Language: nl
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: "Dutch Field1"
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: "Dutch Field2"
diff --git a/tests/YmlTransform.Tests/Data/Multi-Language.ymlexpected b/tests/YmlTransform.Tests/Data/Multi-Language.ymlexpected
new file mode 100644
index 0000000..8a9b59a
--- /dev/null
+++ b/tests/YmlTransform.Tests/Data/Multi-Language.ymlexpected
@@ -0,0 +1,47 @@
+---
+ID: "2a65abb0-3123-469f-a603-5f3b1804713c"
+Parent: "756fff26-90f2-4889-bace-da656e66b9c1"
+Template: "013bc834-c0f6-4377-924e-0de185abfbe7"
+Path: /sitecore/content/Home/MultiLanguage
+DB: master
+Languages:
+- Language: de
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: TransformedField1
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: TransformedField2
+- Language: en
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: TransformedField1
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: TransformedField2
+- Language: fr
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: TransformedField1
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: TransformedField2
+- Language: nl
+  Versions:
+  - Version: 1
+    Fields:
+    - ID: "00000000-0000-0000-0000-000000000000"
+      Hint: Field1
+      Value: TransformedField1
+    - ID: "00000000-0000-0000-0000-000000000001"
+      Hint: Field2
+      Value: TransformedField2
diff --git a/tests/YmlTransform.Tests/Data/Multi-Language.ymltransform b/tests/YmlTransform.Tests/Data/Multi-Language.ymltransform
new file mode 100644
index 0000000..bc0dffd
--- /dev/null
+++ b/tests/YmlTransform.Tests/Data/Multi-Language.ymltransform
@@ -0,0 +1,18 @@
+[
+    {
+        "FieldId": "00000000-0000-0000-0000-000000000000",
+        "Hint": "Field1",
+        "Languages": "*",
+        "Path": "/sitecore/content/Home/MultiLanguage",
+        "Type": "Languages",
+        "Value": "TransformedField1"
+    },
+    {
+        "FieldId": "00000000-0000-0000-0000-000000000001",
+        "Hint": "Field2",
+        "Languages": "*",
+        "Path": "/sitecore/content/Home/MultiLanguage",
+        "Type": "Languages",
+        "Value": "TransformedField2"
+    }
+]
\ No newline at end of file
diff --git a/tests/YmlTransform.Tests/Properties/AssemblyInfo.cs b/tests/YmlTransform.Tests/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..adb5daa
--- /dev/null
+++ b/tests/YmlTransform.Tests/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("YmlTransform.Tests")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("YmlTransform.Tests")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("bb5287ae-b720-4c65-80b0-15f4eb459ba4")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/tests/YmlTransform.Tests/YmlTransform.Tests.csproj b/tests/YmlTransform.Tests/YmlTransform.Tests.csproj
new file mode 100644
index 0000000..75d8286
--- /dev/null
+++ b/tests/YmlTransform.Tests/YmlTransform.Tests.csproj
@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\packages\xunit.runner.visualstudio.2.3.0\build\net20\xunit.runner.visualstudio.props" Condition="Exists('..\..\packages\xunit.runner.visualstudio.2.3.0\build\net20\xunit.runner.visualstudio.props')" />
+  <Import Project="..\..\packages\xunit.core.2.3.0\build\xunit.core.props" Condition="Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.props')" />
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{BB5287AE-B720-4C65-80B0-15F4EB459BA4}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>YmlTransform.Tests</RootNamespace>
+    <AssemblyName>YmlTransform.Tests</AssemblyName>
+    <TargetFrameworkVersion>v4.6.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.ComponentModel.Composition" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Reflection, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\System.Reflection.4.3.0\lib\net462\System.Reflection.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\System.Runtime.4.3.0\lib\net462\System.Runtime.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+    <Reference Include="xunit.abstractions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=8d05b1bb7a6fdb6c, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\xunit.abstractions.2.0.1\lib\net35\xunit.abstractions.dll</HintPath>
+    </Reference>
+    <Reference Include="xunit.assert, Version=2.3.0.3820, Culture=neutral, PublicKeyToken=8d05b1bb7a6fdb6c, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\xunit.assert.2.3.0\lib\netstandard1.1\xunit.assert.dll</HintPath>
+    </Reference>
+    <Reference Include="xunit.core, Version=2.3.0.3820, Culture=neutral, PublicKeyToken=8d05b1bb7a6fdb6c, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\xunit.extensibility.core.2.3.0\lib\netstandard1.1\xunit.core.dll</HintPath>
+    </Reference>
+    <Reference Include="xunit.execution.desktop, Version=2.3.0.3820, Culture=neutral, PublicKeyToken=8d05b1bb7a6fdb6c, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\xunit.extensibility.execution.2.3.0\lib\net452\xunit.execution.desktop.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="YmlTransformerTests.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\YmlTransform\YmlTransform.csproj">
+      <Project>{00EC6644-0EBF-44A8-8EDF-F73D06787377}</Project>
+      <Name>YmlTransform</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="app.config" />
+    <None Include="Data\Multi-Language.ymlexpected">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Include="Data\Multi-Language.yml">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Include="Data\Multi-Language.ymltransform">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Analyzer Include="..\..\packages\xunit.analyzers.0.7.0\analyzers\dotnet\cs\xunit.analyzers.dll" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.props'))" />
+    <Error Condition="!Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.core.2.3.0\build\xunit.core.targets'))" />
+    <Error Condition="!Exists('..\..\packages\xunit.runner.visualstudio.2.3.0\build\net20\xunit.runner.visualstudio.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\xunit.runner.visualstudio.2.3.0\build\net20\xunit.runner.visualstudio.props'))" />
+  </Target>
+  <Import Project="..\..\packages\xunit.core.2.3.0\build\xunit.core.targets" Condition="Exists('..\..\packages\xunit.core.2.3.0\build\xunit.core.targets')" />
+</Project>
\ No newline at end of file
diff --git a/tests/YmlTransform.Tests/YmlTransformerTests.cs b/tests/YmlTransform.Tests/YmlTransformerTests.cs
new file mode 100644
index 0000000..68dadfb
--- /dev/null
+++ b/tests/YmlTransform.Tests/YmlTransformerTests.cs
@@ -0,0 +1,44 @@
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+using Xunit;
+
+namespace YmlTransform.Tests
+{
+    public class YmlTransformerTests
+    {
+        [Fact]
+        public void TestMultiLanguageTranformation()
+        {
+            const string originalFile = @"Data\\Multi-Language.yml";
+            const string expectedFile = @"Data\\Multi-Language.ymlexpected";
+
+
+            YmlTransformer.TransformFile(originalFile, "Data\\Multi-Language.ymltransform");
+
+            var originalHash = GetFileHash(originalFile);
+            var expectedHash = GetFileHash(expectedFile);
+
+            Assert.Equal(expectedHash, originalHash);
+        }
+
+        public string GetFileHash(string filename)
+        {
+            var hash = new SHA1Managed();
+            var clearBytes = File.ReadAllBytes(filename);
+            var hashedBytes = hash.ComputeHash(clearBytes);
+            return ConvertBytesToHex(hashedBytes);
+        }
+
+        public string ConvertBytesToHex(byte[] bytes)
+        {
+            var sb = new StringBuilder();
+
+            for (var i = 0; i < bytes.Length; i++)
+            {
+                sb.Append(bytes[i].ToString("x"));
+            }
+            return sb.ToString();
+        }
+    }
+}
diff --git a/tests/YmlTransform.Tests/app.config b/tests/YmlTransform.Tests/app.config
new file mode 100644
index 0000000..c1ad690
--- /dev/null
+++ b/tests/YmlTransform.Tests/app.config
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.1.1.0" newVersion="4.1.1.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Reflection" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.1.1.0" newVersion="4.1.1.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Runtime.Extensions" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.1.1.0" newVersion="4.1.1.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-10.0.0.0" newVersion="10.0.0.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>
\ No newline at end of file
diff --git a/tests/YmlTransform.Tests/packages.config b/tests/YmlTransform.Tests/packages.config
new file mode 100644
index 0000000..237e800
--- /dev/null
+++ b/tests/YmlTransform.Tests/packages.config
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="System.Reflection" version="4.3.0" targetFramework="net462" />
+  <package id="System.Runtime" version="4.3.0" targetFramework="net462" />
+  <package id="xunit" version="2.3.0" targetFramework="net462" />
+  <package id="xunit.abstractions" version="2.0.1" targetFramework="net462" />
+  <package id="xunit.analyzers" version="0.7.0" targetFramework="net462" />
+  <package id="xunit.assert" version="2.3.0" targetFramework="net462" />
+  <package id="xunit.core" version="2.3.0" targetFramework="net462" />
+  <package id="xunit.extensibility.core" version="2.3.0" targetFramework="net462" />
+  <package id="xunit.extensibility.execution" version="2.3.0" targetFramework="net462" />
+  <package id="xunit.runner.visualstudio" version="2.3.0" targetFramework="net462" developmentDependency="true" />
+</packages>
\ No newline at end of file