diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 21f7542..bc48a7a 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -28,3 +28,22 @@ jobs:
         run: dotnet restore src/Tomas.Terminal
       - name: Build
         run: dotnet build src/Tomas.Terminal -c Release --no-restore
+       
+  test:
+    timeout-minutes: 15
+    continue-on-error: true
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        dotnet: ["6.0.x"]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: ${{ matrix.dotnet }}
+      - name: Install test dependencies
+        run: dotnet restore src/Tomas.Tests
+      - name: Test
+        run: dotnet test src --no-restore --debug
\ No newline at end of file
diff --git a/src/TOMAS.sln b/src/TOMAS.sln
index 44fc703..d18435f 100644
--- a/src/TOMAS.sln
+++ b/src/TOMAS.sln
@@ -22,6 +22,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tomas.Terminal", "Tomas.Ter
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tomas.Kernel", "Tomas.Kernel\Tomas.Kernel.csproj", "{B70BDFD5-64BA-4FCE-A00F-DDD209C2C0FB}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tomas.Tests", "Tomas.Tests\Tomas.Tests.csproj", "{76AD2140-2975-43DA-89A9-0BEC70B2ECDD}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -44,6 +46,10 @@ Global
 		{B70BDFD5-64BA-4FCE-A00F-DDD209C2C0FB}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B70BDFD5-64BA-4FCE-A00F-DDD209C2C0FB}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B70BDFD5-64BA-4FCE-A00F-DDD209C2C0FB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{76AD2140-2975-43DA-89A9-0BEC70B2ECDD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{76AD2140-2975-43DA-89A9-0BEC70B2ECDD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{76AD2140-2975-43DA-89A9-0BEC70B2ECDD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{76AD2140-2975-43DA-89A9-0BEC70B2ECDD}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/src/Tomas.Core/GlobalUsing.cs b/src/Tomas.Core/Usings.cs
similarity index 100%
rename from src/Tomas.Core/GlobalUsing.cs
rename to src/Tomas.Core/Usings.cs
diff --git a/src/Tomas.Interface/Usings.cs b/src/Tomas.Interface/Usings.cs
new file mode 100644
index 0000000..e69de29
diff --git a/src/Tomas.Kernel/SysFS.cs b/src/Tomas.Kernel/SysFS.cs
index 5b5865a..6ad6324 100644
--- a/src/Tomas.Kernel/SysFS.cs
+++ b/src/Tomas.Kernel/SysFS.cs
@@ -8,152 +8,138 @@ namespace Tomas.Kernel;
 
 static class SysFS
 {
- // The root directory of the file system
- public const string ROOT_DIR = "0:\\";
- // The system directory, located in the root directory
- static string SYSTEM_DIR = $"{ROOT_DIR}\\SYSTEM\\";
+    // The root directory of the file system
+    public const string ROOT_DIR = "0:\\";
+    // The system directory, located in the root directory
+    static string SYSTEM_DIR = $"{ROOT_DIR}\\SYSTEM\\";
 
- static string LOG_FILE = $"{SYSTEM_DIR}system.log";
+    static string LOG_FILE = $"{SYSTEM_DIR}system.log";
 
- public const string FS_ERROR = "File system disabled.";
+    public const string FS_ERROR = "File system disabled.";
 
- /// <summary>
- /// An instance of the CosmosVFS class, used for accessing the virtual file system
- /// </summary>
- static CosmosVFS fileSystem = new();
+    /// <summary>
+    /// An instance of the CosmosVFS class, used for accessing the virtual file system
+    /// </summary>
+    static CosmosVFS fileSystem = new();
 
- /// <summary>
- /// Initializes the file system by creating the system directory and sysinfo.txt file
- /// and setting the IsFSActive property of the SysMeta class to true
- /// </summary>
- public static void Initialize()
- {
-  try
-  {
-   var createSysFiles = "Creating system files.";
-   var setSysPref = "Writing system info.";
-   var fsSuccess = "File system succesfully initialized.";
-   var sysInfoFile = "sysinfo.txt";
+    /// <summary>
+    /// Initializes the file system by creating the system directory and sysinfo.txt file
+    /// and setting the IsFSActive property of the SysMeta class to true
+    /// </summary>
+    public static void Initialize()
+    {
+        try
+        {
+            // File to store system information
+            const string sysInfoFile = "sysinfo.txt";
 
-   // Register the CosmosVFS instance as the virtual file system
-   VFSManager.RegisterVFS(fileSystem);
+            // Create system directory if it doesn't exist
+            if (!Directory.Exists(SYSTEM_DIR))
+                fileSystem.CreateDirectory(SYSTEM_DIR);
 
-   // Create the system directory
-   if (!Directory.Exists(SYSTEM_DIR))
-    fileSystem.CreateDirectory(SYSTEM_DIR);
+            // Create system log file if it doesn't exist
+            if (!File.Exists($"{SYSTEM_DIR}{LOG_FILE}"))
+                fileSystem.CreateFile($"{SYSTEM_DIR}{LOG_FILE}");
 
-   // Create the system.log file in the system directory
-   if (!File.Exists($"{SYSTEM_DIR}{LOG_FILE}"))
-    fileSystem.CreateFile($"{SYSTEM_DIR}{LOG_FILE}");
+            // Create sysinfo.txt file if it doesn't exist
+            if (!File.Exists($"{SYSTEM_DIR}{sysInfoFile}"))
+                fileSystem.CreateFile($"{SYSTEM_DIR}{sysInfoFile}");
 
-   Console.WriteLine(createSysFiles);
-   File.AppendAllText(LOG_FILE, createSysFiles);
+            // Write system name, version, and build number to sysinfo.txt file
+            File.WriteAllText($"{SYSTEM_DIR}sysinfo.txt", $"{SysMeta.NAME} v{SysMeta.VERSION} ({SysMeta.BuildNumber})");
 
-   // Create the sysinfo.txt file in the system directory
-   if (!File.Exists($"{SYSTEM_DIR}{sysInfoFile}"))
-    fileSystem.CreateFile($"{SYSTEM_DIR}{sysInfoFile}");
+            // Set IsFSEnabled property of SysMeta class to true
+            SysMeta.IsFSEnabled = true;
 
-   Console.WriteLine(setSysPref);
+            // Read contents of sysinfo.txt file and print to console
+            var systemInfo = File.ReadAllText($"{SYSTEM_DIR}sysinfo.txt");
+            Console.WriteLine(systemInfo);
+        }
+        catch (Exception err)
+        {
+            // Print error message if an exception is caught
+            Console.WriteLine($"{err.Message}{Environment.NewLine}Warning: Error messages will not logged.");
+        }
+    }
 
-   File.AppendAllText(LOG_FILE, setSysPref);
 
-   // Write the system name, version, and build number to the sysinfo.txt file
-   File.WriteAllText($"{SYSTEM_DIR}sysinfo.txt", $"{SysMeta.NAME} v{SysMeta.VERSION} ({SysMeta.BuildNumber})");
 
-   Console.WriteLine(fsSuccess);
-   File.AppendAllText(LOG_FILE, fsSuccess);
+    /// <summary>
+    /// Creates a new directory at the specified path
+    /// </summary>
+    /// <param name="directory">directory</param>
+    public static void CreateDirectory(string directory)
+    {
+        try
+        {
+            // If file system isn't enabeld, throw exception
+            if (!SysMeta.IsFSEnabled)
+                throw new IOException(FS_ERROR);
 
-   // Set the IsFSActive property of the SysMeta class to true
-   SysMeta.IsFSEnabled = true;
+            // Create the directory using the CosmosVFS instance
+            if (!Directory.Exists($"{ROOT_DIR}\\{directory}"))
+                fileSystem.CreateDirectory($"{ROOT_DIR}\\{directory}");
+        }
+        catch (IOException err)
+        {
+            // If an exception is caught, print an error message indicating the error
+            Console.WriteLine(err.Message);
+            File.AppendAllText(LOG_FILE, err.Message);
+        }
+    }
 
-   // Read the contents of the sysinfo.txt file and print it to the console
-   var systemInfo = File.ReadAllText($"{SYSTEM_DIR}sysinfo.txt");
+    /// <summary>
+    /// Creates a new file at the specified path
+    /// </summary>
+    /// <param name="path">file path</param>
+    /// <param name="file">file</param>
+    public static void CreateFile(string path, string file)
+    {
+        try
+        {
+            // If file system isn't enabeld, throw exception
+            if (!SysMeta.IsFSEnabled)
+                throw new IOException(FS_ERROR);
 
-   Console.WriteLine(systemInfo);
-  }
-  catch (Exception err)
-  {
-   // If an exception is caught, print an error message indicating that the file system failed to load
-   Console.WriteLine($"{err.Message}{Environment.NewLine}Warning: Error messages will not logged.");
-  }
- }
+            // Create the file using the CosmosVFS instance
+            if (!File.Exists($"{ROOT_DIR}\\{path}\\{file}"))
+                fileSystem.CreateFile($"{ROOT_DIR}\\{path}\\{file}");
+        }
+        catch (IOException err)
+        {
+            // If an exception is caught, print an error message indicating the error
+            Console.WriteLine(err.Message);
+            File.AppendAllText(LOG_FILE, err.Message);
+        }
+    }
 
- /// <summary>
- /// Creates a new directory at the specified path
- /// </summary>
- /// <param name="directory">directory</param>
- public static void CreateDirectory(string directory)
- {
-  try
-  {
-   // If file system isn't enabeld, throw exception
-   if (!SysMeta.IsFSEnabled)
-    throw new IOException(FS_ERROR);
+    /// <summary>
+    /// Lists all directories in the specified path
+    /// </summary>
+    /// <param name="path">path to directory</param>
+    /// <returns>returns a list of directories</returns>
+    public static string[] ListDirectories(string path)
+    {
+        try
+        {
+            // If file system isn't enabeld, throw exception
+            if (!SysMeta.IsFSEnabled)
+                throw new IOException(FS_ERROR);
 
-   // Create the directory using the CosmosVFS instance
-   if (!Directory.Exists($"{ROOT_DIR}\\{directory}"))
-    fileSystem.CreateDirectory($"{ROOT_DIR}\\{directory}");
-  }
-  catch (IOException err)
-  {
-   // If an exception is caught, print an error message indicating the error
-   Console.WriteLine(err.Message);
-   File.AppendAllText(LOG_FILE, err.Message);
-  }
- }
+            // Get the directories in the specified path using the Directory.GetDirectories method
+            var dirs = Directory.GetDirectories(path);
 
- /// <summary>
- /// Creates a new file at the specified path
- /// </summary>
- /// <param name="path">file path</param>
- /// <param name="file">file</param>
- public static void CreateFile(string path, string file)
- {
-  try
-  {
-   // If file system isn't enabeld, throw exception
-   if (!SysMeta.IsFSEnabled)
-    throw new IOException(FS_ERROR);
+            // Return the directories
+            return dirs;
+        }
+        catch (IOException err)
+        {
+            // If an exception is caught, print an error message indicating the error
+            Console.WriteLine(err.Message);
+            File.AppendAllText(LOG_FILE, err.Message);
 
-   // Create the file using the CosmosVFS instance
-   if (!File.Exists($"{ROOT_DIR}\\{path}\\{file}"))
-    fileSystem.CreateFile($"{ROOT_DIR}\\{path}\\{file}");
-  }
-  catch (IOException err)
-  {
-   // If an exception is caught, print an error message indicating the error
-   Console.WriteLine(err.Message);
-   File.AppendAllText(LOG_FILE, err.Message);
-  }
- }
-
- /// <summary>
- /// Lists all directories in the specified path
- /// </summary>
- /// <param name="path">path to directory</param>
- /// <returns>returns a list of directories</returns>
- public static string[] ListDirectories(string path)
- {
-  try
-  {
-   // If file system isn't enabeld, throw exception
-   if (!SysMeta.IsFSEnabled)
-    throw new IOException(FS_ERROR);
-
-   // Get the directories in the specified path using the Directory.GetDirectories method
-   var dirs = Directory.GetDirectories(path);
-
-   // Return the directories
-   return dirs;
-  }
-  catch (IOException err)
-  {
-   // If an exception is caught, print an error message indicating the error
-   Console.WriteLine(err.Message);
-   File.AppendAllText(LOG_FILE, err.Message);
-
-   throw;
-  }
- }
+            throw;
+        }
+    }
 }
 
diff --git a/src/Tomas.Kernel/GlobalUsing.cs b/src/Tomas.Kernel/Usings.cs
similarity index 100%
rename from src/Tomas.Kernel/GlobalUsing.cs
rename to src/Tomas.Kernel/Usings.cs
diff --git a/src/Tomas.Tests/Shell/MockProgram.cs b/src/Tomas.Tests/Shell/MockProgram.cs
new file mode 100644
index 0000000..3077976
--- /dev/null
+++ b/src/Tomas.Tests/Shell/MockProgram.cs
@@ -0,0 +1,16 @@
+/*
+In jurisdictions that recognize copyright waivers, I've waived all copyright
+and related or neighboring rights for to this project. In areas where these
+waivers are not recognized, BSD-3-Clause is enforced.
+See the (UN)LICENSE file in the project root for more information.
+*/
+namespace Tomas.Tests.Shell;
+
+internal class MockProgram : IProgram
+{
+    public bool Run(IShell shell)
+    {
+        Debug.WriteLine("Test Program.");
+        return true;
+    }
+}
diff --git a/src/Tomas.Tests/Shell/MockShell.cs b/src/Tomas.Tests/Shell/MockShell.cs
new file mode 100644
index 0000000..0ea450a
--- /dev/null
+++ b/src/Tomas.Tests/Shell/MockShell.cs
@@ -0,0 +1,17 @@
+/*
+In jurisdictions that recognize copyright waivers, I've waived all copyright
+and related or neighboring rights for to this project. In areas where these
+waivers are not recognized, BSD-3-Clause is enforced.
+See the (UN)LICENSE file in the project root for more information.
+*/
+namespace Tomas.Tests.Shell;
+
+internal class MockShell : IShell
+{
+    public string? ReadLine { get; }
+
+    public Dictionary<string, IProgram> Programs => new()
+    {
+        { "test", new MockProgram() },
+    };
+}
diff --git a/src/Tomas.Tests/ShellTests.cs b/src/Tomas.Tests/ShellTests.cs
new file mode 100644
index 0000000..e837252
--- /dev/null
+++ b/src/Tomas.Tests/ShellTests.cs
@@ -0,0 +1,26 @@
+/*
+In jurisdictions that recognize copyright waivers, I've waived all copyright
+and related or neighboring rights for to this project. In areas where these
+waivers are not recognized, BSD-3-Clause is enforced.
+See the (UN)LICENSE file in the project root for more information.
+*/
+using Tomas.Tests.Shell;
+
+namespace Tomas.Tests;
+
+public class ShellTests
+{
+    // Create a new instance of the mock shell
+    readonly MockShell _mockShell = new();
+
+    [Fact]
+    public void ProgramTest()
+    {
+        // Create a mock program
+        var program = new MockProgram();
+
+        // Assert that the Run method of the program and returns true when passed the shell object.
+        Assert.True(program.Run(_mockShell));
+    }
+
+}
\ No newline at end of file
diff --git a/src/Tomas.Tests/Tomas.Tests.csproj b/src/Tomas.Tests/Tomas.Tests.csproj
new file mode 100644
index 0000000..5c6309a
--- /dev/null
+++ b/src/Tomas.Tests/Tomas.Tests.csproj
@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+        <PackageReference Include="xunit" Version="2.4.2" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="3.1.2">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Tomas.Core\Tomas.Core.csproj" />
+      <ProjectReference Include="..\Tomas.Interface\Tomas.Interface.csproj" />
+    </ItemGroup>
+
+</Project>
diff --git a/src/Tomas.Tests/Usings.cs b/src/Tomas.Tests/Usings.cs
new file mode 100644
index 0000000..d97cace
--- /dev/null
+++ b/src/Tomas.Tests/Usings.cs
@@ -0,0 +1,11 @@
+/*
+In jurisdictions that recognize copyright waivers, I've waived all copyright
+and related or neighboring rights for to this project. In areas where these
+waivers are not recognized, BSD-3-Clause is enforced.
+See the (UN)LICENSE file in the project root for more information.
+*/
+global using Xunit;
+global using System.Diagnostics.CodeAnalysis;
+global using System.Diagnostics;
+global using Tomas.Core;
+global using Tomas.Interface;
\ No newline at end of file