diff --git a/src/WebExpress.WebUI.Test/WebHtml/UnitTestDeterministicId.cs b/src/WebExpress.WebUI.Test/WebHtml/UnitTestDeterministicId.cs
new file mode 100644
index 0000000..64d8e1d
--- /dev/null
+++ b/src/WebExpress.WebUI.Test/WebHtml/UnitTestDeterministicId.cs
@@ -0,0 +1,80 @@
+using WebExpress.WebCore.WebHtml;
+
+namespace WebExpress.WebUI.Test.WebHtml
+{
+    /// <summary>
+    /// Unit tests for the DeterministicId class.
+    /// </summary>
+    [Collection("NonParallelTests")]
+    public class UnitTestDeterministicId
+    {
+        /// <summary>
+        /// Tests that two calls to Create from the same callsite produce different identifiers.
+        /// </summary>
+        [Fact]
+        public void CreateSameCallsite()
+        {
+            // act
+            var id1 = CallCreate();
+            var id2 = CallCreate();
+
+            // validation
+            Assert.NotEqual(id1, id2);
+        }
+
+        /// <summary>
+        /// Tests that Create with different context values produces different identifiers.
+        /// </summary>
+        [Fact]
+        public void CreateIndexes()
+        {
+            // act
+            var id1 = CallCreate(0);
+            var id2 = CallCreate(1);
+
+            // validation
+            Assert.NotEqual(id1, id2);
+        }
+
+        /// <summary>
+        /// Tests that calls from different call sites produce different identifiers.
+        /// </summary>
+        [Fact]
+        public void CreateDifferentCallsites()
+        {
+            // arrange
+            var callsiteA = new Func<string>(() => DeterministicId.Create());
+            var callsiteB = new Func<string>(() => DeterministicId.Create());
+
+            // act
+            var id1 = callsiteA();
+            var id2 = callsiteB();
+
+            // validation
+            Assert.NotEqual(id1, id2);
+        }
+
+        /// <summary>
+        /// Generates a deterministic identifier.
+        /// </summary>
+        /// <returns>A string that represents the generated deterministic identifier.</returns>
+        private string CallCreate()
+        {
+            return DeterministicId.Create();
+        }
+
+        /// <summary>
+        /// Generates a deterministic identifier based on the specified context.
+        /// </summary>
+        /// <param name="context">
+        /// The context used to influence the generated identifier.
+        /// </param>
+        /// <returns>
+        /// A string that represents the generated deterministic identifier.
+        /// </returns>
+        private string CallCreate(object context)
+        {
+            return DeterministicId.Create(context);
+        }
+    }
+}