diff --git a/test/Microsoft.AspNetCore.Localization.Tests/AcceptLanguageHeaderRequestCultureProviderTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/AcceptLanguageHeaderRequestCultureProviderTest.cs
index a745fafa5e..4861c8ac08 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/AcceptLanguageHeaderRequestCultureProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/AcceptLanguageHeaderRequestCultureProviderTest.cs
@@ -15,7 +15,7 @@ namespace Microsoft.Extensions.Localization.Tests
     public class AcceptLanguageHeaderRequestCultureProviderTest
     {
         [Fact]
-        public async void GetFallbackLanguage_ReturnsFirstNonNullCultureFromSupportedCultureList()
+        public async Task GetFallbackLanguage_ReturnsFirstNonNullCultureFromSupportedCultureList()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -49,7 +49,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetFallbackLanguage_ReturnsFromSupportedCulture_AcceptLanguageListContainsSupportedCultures()
+        public async Task GetFallbackLanguage_ReturnsFromSupportedCulture_AcceptLanguageListContainsSupportedCultures()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -82,7 +82,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetFallbackLanguage_ReturnsDefault_AcceptLanguageListDoesnotContainSupportedCultures()
+        public async Task GetFallbackLanguage_ReturnsDefault_AcceptLanguageListDoesnotContainSupportedCultures()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -116,7 +116,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
         
         [Fact]
-        public async void OmitDefaultRequestCultureShouldNotThrowNullReferenceException_And_ShouldGetTheRightCulture()
+        public async Task OmitDefaultRequestCultureShouldNotThrowNullReferenceException_And_ShouldGetTheRightCulture()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
index a44233eeb9..d40833e97a 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/CookieRequestCultureProviderTest.cs
@@ -16,7 +16,7 @@ namespace Microsoft.Extensions.Localization.Tests
     public class CookieRequestCultureProviderTest
     {
         [Fact]
-        public async void GetCultureInfoFromPersistentCookie()
+        public async Task GetCultureInfoFromPersistentCookie()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -60,7 +60,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetDefaultCultureInfoIfCultureKeysAreMissingOrInvalid()
+        public async Task GetDefaultCultureInfoIfCultureKeysAreMissingOrInvalid()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -99,7 +99,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetDefaultCultureInfoIfCookieDoesNotExist()
+        public async Task GetDefaultCultureInfoIfCookieDoesNotExist()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/CustomRequestCultureProviderTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/CustomRequestCultureProviderTest.cs
index 39ec08ebc7..f48f63243c 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/CustomRequestCultureProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/CustomRequestCultureProviderTest.cs
@@ -17,7 +17,7 @@ namespace Microsoft.Extensions.Localization.Tests
     public class CustomRequestCultureProviderTest
     {
         [Fact]
-        public async void CustomRequestCultureProviderThatGetsCultureInfoFromUrl()
+        public async Task CustomRequestCultureProviderThatGetsCultureInfoFromUrl()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
diff --git a/test/Microsoft.AspNetCore.Localization.Tests/QueryStringRequestCultureProviderTest.cs b/test/Microsoft.AspNetCore.Localization.Tests/QueryStringRequestCultureProviderTest.cs
index 5ff918530b..d7935fc113 100644
--- a/test/Microsoft.AspNetCore.Localization.Tests/QueryStringRequestCultureProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Localization.Tests/QueryStringRequestCultureProviderTest.cs
@@ -15,7 +15,7 @@ namespace Microsoft.Extensions.Localization.Tests
     public class QueryStringRequestCultureProviderTest
     {
         [Fact]
-        public async void GetCultureInfoFromQueryString()
+        public async Task GetCultureInfoFromQueryString()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -50,7 +50,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetDefaultCultureInfoIfCultureKeysAreMissing()
+        public async Task GetDefaultCultureInfoIfCultureKeysAreMissing()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -77,7 +77,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetDefaultCultureInfoIfCultureIsInSupportedCultureList()
+        public async Task GetDefaultCultureInfoIfCultureIsInSupportedCultureList()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -111,7 +111,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetDefaultCultureInfoIfUICultureIsNotInSupportedList()
+        public async Task GetDefaultCultureInfoIfUICultureIsNotInSupportedList()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -145,7 +145,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetSameCultureInfoIfCultureKeyIsMissing()
+        public async Task GetSameCultureInfoIfCultureKeyIsMissing()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -180,7 +180,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetSameCultureInfoIfUICultureKeyIsMissing()
+        public async Task GetSameCultureInfoIfUICultureKeyIsMissing()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -215,7 +215,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetCultureInfoFromQueryStringWithCustomKeys()
+        public async Task GetCultureInfoFromQueryStringWithCustomKeys()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>
@@ -255,7 +255,7 @@ namespace Microsoft.Extensions.Localization.Tests
         }
 
         [Fact]
-        public async void GetTheRightCultureInfoRegardlessOfCultureNameCasing()
+        public async Task GetTheRightCultureInfoRegardlessOfCultureNameCasing()
         {
             var builder = new WebHostBuilder()
                 .Configure(app =>