diff --git a/Chrono/Chrono.sln b/Chrono/Chrono.sln
index 91001c9..95e905f 100644
--- a/Chrono/Chrono.sln
+++ b/Chrono/Chrono.sln
@@ -8,6 +8,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Model", "Model\Model.csproj
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Deploy", "Deploy\Deploy.csproj", "{E5E9A799-76C8-43B3-B9C2-3CAEC2B5E1DD}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tests", "Tests\Tests.csproj", "{90F32056-6983-4224-8A8C-E797C71633F3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -30,5 +32,9 @@ Global
 		{E5E9A799-76C8-43B3-B9C2-3CAEC2B5E1DD}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E5E9A799-76C8-43B3-B9C2-3CAEC2B5E1DD}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E5E9A799-76C8-43B3-B9C2-3CAEC2B5E1DD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{90F32056-6983-4224-8A8C-E797C71633F3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{90F32056-6983-4224-8A8C-E797C71633F3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{90F32056-6983-4224-8A8C-E797C71633F3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{90F32056-6983-4224-8A8C-E797C71633F3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal
diff --git a/Chrono/Tests/Tests.cs b/Chrono/Tests/Tests.cs
new file mode 100644
index 0000000..55cdbad
--- /dev/null
+++ b/Chrono/Tests/Tests.cs
@@ -0,0 +1,55 @@
+using Chrono.Model;
+
+namespace Tests;
+
+public class CardDataTests
+{
+    [Test]
+    public void StatEfficiency_CalculatesCorrectly()
+    {
+        var card = new CardData { Cost = 2, Attack = 2, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(2.5f));
+    }
+
+    [Test]
+    public void StatEfficiency_ReturnsZero_WhenCostIsZero()
+    {
+        var card = new CardData { Cost = 0, Attack = 2, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(0f));
+    }
+
+    [Test]
+    public void StatEfficiency_ReturnsZero_WhenAttackIsNull()
+    {
+        var card = new CardData { Cost = 2, Attack = null, Health = 3 };
+        Assert.That(card.StatEfficiency, Is.EqualTo(0f));
+    }
+
+    [Test]
+    public void IsAgent_ReturnsTrue_WhenCategoryIsAgent()
+    {
+        var card = new CardData { Category = "Agent" };
+        Assert.That(card.IsAgent, Is.True);
+    }
+
+    [Test]
+    public void IsSpell_ReturnsTrue_WhenCategoryIsSpell()
+    {
+        var card = new CardData { Category = "Spell" };
+        Assert.That(card.IsSpell, Is.True);
+    }
+
+    [Test]
+    public void ImagePath_UsesPlaceholder_WhenImageFileIsNull()
+    {
+        var card = new CardData { ImageFile = null };
+        Assert.That(card.ImagePath, Is.EqualTo("cards/placeholder.png"));
+    }
+
+    [Test]
+    public void StatEfficiency_RoundsToTwoDecimalPlaces()
+    {
+        var card = new CardData { Cost = 3, Attack = 1, Health = 1 }; // (1+1)/3 = 0.666...
+        Assert.That(card.StatEfficiency, Is.EqualTo(0.67f));
+    }
+}
\ No newline at end of file
diff --git a/Chrono/Tests/Tests.csproj b/Chrono/Tests/Tests.csproj
new file mode 100644
index 0000000..7606a27
--- /dev/null
+++ b/Chrono/Tests/Tests.csproj
@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <LangVersion>latest</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="coverlet.collector" Version="6.0.4"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0"/>
+        <PackageReference Include="Microsoft.Playwright.NUnit" Version="1.60.0" />
+        <PackageReference Include="NUnit" Version="4.3.2"/>
+        <PackageReference Include="NUnit.Analyzers" Version="4.7.0"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="5.0.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\Model\Model.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <Using Include="NUnit.Framework"/>
+    </ItemGroup>
+
+</Project>