diff --git a/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/Helpers/ReflectHelperTests.cs b/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/Helpers/ReflectHelperTests.cs
index 884e2d6c6b..c37d2d432a 100644
--- a/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/Helpers/ReflectHelperTests.cs
+++ b/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/Helpers/ReflectHelperTests.cs
@@ -69,12 +69,32 @@ public void GetTestCategoryAttributeShouldIncludeTestCategoriesAtClassLevel()
         [TestMethod]
         public void GetTestCategoryAttributeShouldIncludeTestCategoriesAtAllLevels()
         {
-            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("AsmLevel") }, MemberTypes.All);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("AsmLevel1"), new UTF.TestCategoryAttribute("AsmLevel2") }, MemberTypes.All);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("AsmLevel3") }, MemberTypes.All);
             this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("ClassLevel") }, MemberTypes.TypeInfo);
             this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("MethodLevel") }, MemberTypes.Method);
 
             var actual = this.reflectHelper.GetCategories(this.method.Object).ToArray();
-            string[] expected = new[] { "MethodLevel", "ClassLevel", "AsmLevel" };
+            string[] expected = new[] { "MethodLevel", "ClassLevel", "AsmLevel1", "AsmLevel2", "AsmLevel3" };
+
+            CollectionAssert.AreEqual(expected, actual);
+        }
+
+        /// <summary>
+        /// Testing test category attributes adorned at calss, assembly and method level are getting collected.
+        /// </summary>
+        [TestMethod]
+        public void GetTestCategoryAttributeShouldConcatCustomAttributeOfSameType()
+        {
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("AsmLevel1") }, MemberTypes.All);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("AsmLevel2") }, MemberTypes.All);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("ClassLevel1") }, MemberTypes.TypeInfo);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("ClassLevel2") }, MemberTypes.TypeInfo);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("MethodLevel1") }, MemberTypes.Method);
+            this.reflectHelper.SetCustomAttribute(typeof(UTF.TestCategoryBaseAttribute), new[] { new UTF.TestCategoryAttribute("MethodLevel2") }, MemberTypes.Method);
+
+            var actual = this.reflectHelper.GetCategories(this.method.Object).ToArray();
+            string[] expected = new[] { "MethodLevel1", "MethodLevel2", "ClassLevel1", "ClassLevel2", "AsmLevel1", "AsmLevel2" };
 
             CollectionAssert.AreEqual(expected, actual);
         }
diff --git a/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/TestableImplementations/TestableReflectHelper.cs b/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/TestableImplementations/TestableReflectHelper.cs
index c09e9dba37..3f38b01e81 100644
--- a/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/TestableImplementations/TestableReflectHelper.cs
+++ b/test/UnitTests/MSTest.CoreAdapter.Unit.Tests/TestableImplementations/TestableReflectHelper.cs
@@ -33,7 +33,7 @@ public void SetCustomAttribute(Type type, Attribute[] values, MemberTypes member
             var hashcode = type.FullName.GetHashCode() + memberTypes.GetHashCode();
             if (this.customAttributes.ContainsKey(hashcode))
             {
-                this.customAttributes[hashcode].Concat(values);
+                this.customAttributes[hashcode] = this.customAttributes[hashcode].Concat(values).ToArray();
             }
             else
             {