diff --git a/src/Reveal.Sdk.Dom.Tests/Data/FunctionDataSourceItemFixture.cs b/src/Reveal.Sdk.Dom.Tests/Data/FunctionDataSourceItemFixture.cs
new file mode 100644
index 0000000..6fdd395
--- /dev/null
+++ b/src/Reveal.Sdk.Dom.Tests/Data/FunctionDataSourceItemFixture.cs
@@ -0,0 +1,27 @@
+using Moq;
+using Reveal.Sdk.Dom.Data;
+using Xunit;
+
+namespace Reveal.Sdk.Dom.Tests.Data
+{
+    public class FunctionDataSourceItemFixture
+    {
+        [Fact]
+        public void Constructor_CreateFunctionDataSource_WithTitleAndDataSource()
+        {
+            // Arrange
+            var title = "Title";
+            var dataSource = new DataSource();
+
+            // Act
+            var mock = new Mock<FunctionDataSourceItem>(title, dataSource) { CallBase = true };
+            var functionDataSourceItem = mock.Object;
+
+            // Assert
+            Assert.Equal(title, functionDataSourceItem.Title);
+            Assert.Equal(dataSource, functionDataSourceItem.DataSource);
+            Assert.Equal(dataSource.Id, functionDataSourceItem.DataSourceId);
+            Assert.Equal(title, functionDataSourceItem.DataSource.Title);
+        }
+    }
+}