diff --git a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumType.cs b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumType.cs
index a91e10082..ce69f97ba 100644
--- a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumType.cs
+++ b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumType.cs
@@ -3,6 +3,8 @@
 // ------------------------------------------------------------------------------
 
 
+using System.Runtime.Serialization;
+
 namespace Microsoft.Graph.DotnetCore.Core.Test.TestModels
 {
     /// <summary>
@@ -10,6 +12,7 @@ namespace Microsoft.Graph.DotnetCore.Core.Test.TestModels
     /// </summary>
     public enum EnumType
     {
+        [EnumMember(Value = "value")]
         Value,
     }
 }
diff --git a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumTypeWithFlags.cs b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumTypeWithFlags.cs
index ba0bf4c42..8cb8dd0ca 100644
--- a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumTypeWithFlags.cs
+++ b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/EnumTypeWithFlags.cs
@@ -3,6 +3,8 @@
 // ------------------------------------------------------------------------------
 
 
+using System.Runtime.Serialization;
+
 namespace Microsoft.Graph.DotnetCore.Core.Test.TestModels
 {
     /// <summary>
@@ -11,8 +13,9 @@ namespace Microsoft.Graph.DotnetCore.Core.Test.TestModels
     [System.Flags]
     public enum EnumTypeWithFlags
     {
+        [EnumMember(Value = "firstValue")]
         FirstValue = 1,
-
+        [EnumMember(Value = "secondValue")]
         SecondValue = 2
     }
 }
\ No newline at end of file
diff --git a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/ServiceModels/TestBodyType.cs b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/ServiceModels/TestBodyType.cs
index 430e80121..2a9960e0f 100644
--- a/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/ServiceModels/TestBodyType.cs
+++ b/tests/Microsoft.Graph.DotnetCore.Core.Test/TestModels/ServiceModels/TestBodyType.cs
@@ -2,6 +2,8 @@
 //  Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
 // ------------------------------------------------------------------------------
 
+using System.Runtime.Serialization;
+
 namespace Microsoft.Graph.DotnetCore.Core.Test.TestModels.ServiceModels
 {
     /// <summary>
@@ -13,11 +15,13 @@ public enum TestBodyType
         /// <summary>
         /// Text
         /// </summary>
+        [EnumMember(Value = "text")]
         Text = 0,
 
         /// <summary>
         /// Html
         /// </summary>
+        [EnumMember(Value = "html")]
         Html = 1,
 
     }