diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.UnitTests/ObjectModel/DefaultActionExecutorTest.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.UnitTests/ObjectModel/DefaultActionExecutorTest.cs
new file mode 100644
index 0000000000..0e7f0a4558
--- /dev/null
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.UnitTests/ObjectModel/DefaultActionExecutorTest.cs
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Threading.Tasks;
+using Microsoft.Agents.AI.Workflows.Declarative.ObjectModel;
+using Microsoft.Agents.ObjectModel;
+using Xunit.Abstractions;
+
+namespace Microsoft.Agents.AI.Workflows.Declarative.UnitTests.ObjectModel;
+
+/// <summary>
+/// Tests for <see cref="DefaultActionExecutor"/>.
+/// </summary>
+public sealed class DefaultActionExecutorTest(ITestOutputHelper output) : WorkflowActionExecutorTest(output)
+{
+    [Fact]
+    public async Task ExecuteDefaultActionAsync()
+    {
+        // Arrange, Act & Assert
+        await this.ExecuteTestAsync(
+                this.FormatDisplayName(nameof(ExecuteDefaultActionAsync)));
+    }
+
+    private async Task ExecuteTestAsync(string displayName)
+    {
+        // Arrange
+        ResetVariable model = this.CreateModel(displayName);
+
+        // Act
+        DefaultActionExecutor action = new(model, this.State);
+        WorkflowEvent[] events = await this.ExecuteAsync(action);
+
+        // Assert
+        VerifyModel(model, action);
+        Assert.NotEmpty(events);
+    }
+
+    private ResetVariable CreateModel(string displayName)
+    {
+        // Use a simple concrete action type since DialogAction.Builder is abstract
+        ResetVariable.Builder actionBuilder =
+            new()
+            {
+                Id = this.CreateActionId(),
+                DisplayName = this.FormatDisplayName(displayName),
+                Variable = PropertyPath.Create(FormatVariablePath("TestVariable")),
+            };
+
+        return AssignParent<ResetVariable>(actionBuilder);
+    }
+}