diff --git a/OptimizelySDK.Tests/EventTests/UserEventFactoryTest.cs b/OptimizelySDK.Tests/EventTests/UserEventFactoryTest.cs
index ecf42fca..7edc2a5f 100644
--- a/OptimizelySDK.Tests/EventTests/UserEventFactoryTest.cs
+++ b/OptimizelySDK.Tests/EventTests/UserEventFactoryTest.cs
@@ -1,12 +1,12 @@
-/**
+/*
  *
- *    Copyright 2019-2020, Optimizely and contributors
+ *    Copyright 2019-2020, 2023 Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
  *    You may obtain a copy of the License at
  *
- *        http://www.apache.org/licenses/LICENSE-2.0
+ *        https://www.apache.org/licenses/LICENSE-2.0
  *
  *    Unless required by applicable law or agreed to in writing, software
  *    distributed under the License is distributed on an "AS IS" BASIS,
@@ -15,6 +15,7 @@
  *    limitations under the License.
  */
 
+using System;
 using Moq;
 using NUnit.Framework;
 using OptimizelySDK.Config;
@@ -96,6 +97,25 @@ public void ImpressionEventTestWithAttributes()
             TestData.CompareObjects(expectedVisitorAttributes, impressionEvent.VisitorAttributes);
         }
 
+        [Test]
+        public void EventFactoryBuildShouldLogInvalidUserAttributes()
+        {
+            var projectConfig = Config;
+
+            var invalidUserAttributes = new UserAttributes
+            {
+                { "invalid_date_object", new DateTime() },
+                { "invalid_array_use", new int[7] },
+            };
+            var expectedInvalidMessage =
+                $"User attributes: invalid_date_object, invalid_array_use were invalid and omitted.";
+
+            EventFactory.BuildAttributeList(invalidUserAttributes, projectConfig,
+                LoggerMock.Object);
+
+            LoggerMock.Verify(l => l.Log(LogLevel.WARN, expectedInvalidMessage), Times.Once());
+        }
+
         [Test]
         public void ConversionEventTest()
         {