diff --git a/src/Microsoft.Extensions.Localization/LocalizationServiceCollectionExtensions.cs b/src/Microsoft.Extensions.Localization/LocalizationServiceCollectionExtensions.cs
index 05ee6e9f7e..d68dc0fd80 100644
--- a/src/Microsoft.Extensions.Localization/LocalizationServiceCollectionExtensions.cs
+++ b/src/Microsoft.Extensions.Localization/LocalizationServiceCollectionExtensions.cs
@@ -1,5 +1,5 @@
-// Copyright (c) .NET Foundation. All rights reserved. 
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. 
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
 using Microsoft.Extensions.DependencyInjection.Extensions;
@@ -25,15 +25,16 @@ namespace Microsoft.Extensions.DependencyInjection
 
             services.AddOptions();
 
-            services.TryAddSingleton<IStringLocalizerFactory, ResourceManagerStringLocalizerFactory>();
-            services.TryAddTransient(typeof(IStringLocalizer<>), typeof(StringLocalizer<>));
+            AddLocalizationServices(services);
         }
 
         /// <summary>
         /// Adds services required for application localization.
         /// </summary>
         /// <param name="services">The <see cref="IServiceCollection"/> to add the services to.</param>
-        /// <param name="setupAction">An <see cref="Action{LocalizationOptions}"/> to configure the <see cref="LocalizationOptions"/>.</param>
+        /// <param name="setupAction">
+        /// An <see cref="Action{LocalizationOptions}"/> to configure the <see cref="LocalizationOptions"/>.
+        /// </param>
         public static void AddLocalization(
             this IServiceCollection services,
             Action<LocalizationOptions> setupAction)
@@ -42,12 +43,27 @@ namespace Microsoft.Extensions.DependencyInjection
             {
                 throw new ArgumentNullException(nameof(services));
             }
+
             if (setupAction == null)
             {
                 throw new ArgumentNullException(nameof(setupAction));
             }
 
-            services.AddLocalization();
+            AddLocalizationServices(services, setupAction);
+        }
+
+        // To enable unit testing
+        internal static void AddLocalizationServices(IServiceCollection services)
+        {
+            services.TryAddSingleton<IStringLocalizerFactory, ResourceManagerStringLocalizerFactory>();
+            services.TryAddTransient(typeof(IStringLocalizer<>), typeof(StringLocalizer<>));
+        }
+
+        internal static void AddLocalizationServices(
+            IServiceCollection services,
+            Action<LocalizationOptions> setupAction)
+        {
+            AddLocalizationServices(services);
             services.Configure(setupAction);
         }
     }
diff --git a/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs b/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
index 804c8971b5..24ba3c7ad9 100644
--- a/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
+++ b/test/Microsoft.Extensions.Localization.Tests/LocalizationServiceCollectionExtensionsTest.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved. 
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Linq;
@@ -17,7 +17,7 @@ namespace Microsoft.Extensions.Localization.Test
             var collection = new ServiceCollection();
 
             // Act
-            collection.AddLocalization();
+            LocalizationServiceCollectionExtensions.AddLocalizationServices(collection);
 
             // Assert
             var services = collection.ToList();
@@ -39,7 +39,9 @@ namespace Microsoft.Extensions.Localization.Test
             var collection = new ServiceCollection();
 
             // Act
-            collection.AddLocalization(options => options.ResourcesPath = "Resources");
+            LocalizationServiceCollectionExtensions.AddLocalizationServices(
+                collection,
+                options => options.ResourcesPath = "Resources");
 
             // Assert
             var services = collection.ToList();