diff --git a/VAR.WebFormsCore.Tests/Code/UnitTests.cs b/VAR.WebFormsCore.Tests/Code/UnitTests.cs
new file mode 100644
index 0000000..ed98ae2
--- /dev/null
+++ b/VAR.WebFormsCore.Tests/Code/UnitTests.cs
@@ -0,0 +1,57 @@
+using Xunit;
+using VAR.WebFormsCore.Code;
+
+namespace VAR.WebFormsCore.Tests.Code;
+
+public class UnitTests
+{
+    [Fact]
+    public void ToString__100px__100px()
+    {
+        Unit unit = new(100, UnitType.Pixel);
+
+        string result = unit.ToString();
+        
+        Assert.Equal("100px", result);
+    }
+    
+    [Fact]
+    public void ToString__50px__50px()
+    {
+        Unit unit = new(100, UnitType.Pixel);
+
+        string result = unit.ToString();
+        
+        Assert.Equal("100px", result);
+    }
+    
+    [Fact]
+    public void ToString__100pc__100pc()
+    {
+        Unit unit = new(100, UnitType.Percentage);
+
+        string result = unit.ToString();
+        
+        Assert.Equal("100%", result);
+    }
+    
+    [Fact]
+    public void ToString__50pc__50pc()
+    {
+        Unit unit = new(100, UnitType.Percentage);
+
+        string result = unit.ToString();
+        
+        Assert.Equal("100%", result);
+    }
+    
+    [Fact]
+    public void ToString__100UnknownUnits__Empty()
+    {
+        Unit unit = new(100, (UnitType)1000);
+
+        string result = unit.ToString();
+        
+        Assert.Equal(string.Empty, result);
+    }
+}
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