diff --git a/src/libraries/System.Net.Requests/tests/QuicLoad.cs b/src/libraries/Common/tests/System/Net/QuicLoad.cs
similarity index 100%
rename from src/libraries/System.Net.Requests/tests/QuicLoad.cs
rename to src/libraries/Common/tests/System/Net/QuicLoad.cs
diff --git a/src/libraries/System.Net.Mail/tests/Functional/System.Net.Mail.Functional.Tests.csproj b/src/libraries/System.Net.Mail/tests/Functional/System.Net.Mail.Functional.Tests.csproj
index bd5ad6e087289f..ceaba6efcff318 100644
--- a/src/libraries/System.Net.Mail/tests/Functional/System.Net.Mail.Functional.Tests.csproj
+++ b/src/libraries/System.Net.Mail/tests/Functional/System.Net.Mail.Functional.Tests.csproj
@@ -4,6 +4,7 @@
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)-Browser;$(NetCoreAppCurrent)-OSX;$(NetCoreAppCurrent)-iOS;$(NetCoreAppCurrent)-Android</TargetFrameworks>
     <EnableLibraryImportGenerator>true</EnableLibraryImportGenerator>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <EnablePreviewFeatures>true</EnablePreviewFeatures>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AlternateViewCollectionTest.cs" />
@@ -24,6 +25,8 @@
              Link="Common\System\Diagnostics\Tracing\TestEventListener.cs" />
     <Compile Include="$(CommonTestPath)System\IO\TempFile.cs"
              Link="Common\System\IO\TempFile.cs" />
+    <Compile Include="$(CommonTestPath)System\Net\QuicLoad.cs"
+             Link="Common\System\Net\System\Net\QuicLoad.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
   </ItemGroup>
diff --git a/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj b/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
index 0e063a6e12a0f9..413a4da999f62c 100644
--- a/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
+++ b/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
@@ -15,7 +15,6 @@
     <Compile Include="AssemblyInfo.cs" />
     <Compile Include="HttpWebRequestTest.cs" />
     <Compile Include="HttpWebResponseTest.cs" />
-    <Compile Include="QuicLoad.cs" />
     <Compile Include="RequestStreamTest.cs" />
     <Compile Include="WebRequestTest.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Capability.Security.cs"
@@ -28,6 +27,8 @@
              Link="Common\System\Net\Configuration.Http.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Configuration.Security.cs"
              Link="Common\System\Net\Configuration.Security.cs" />
+    <Compile Include="$(CommonTestPath)System\Net\QuicLoad.cs"
+             Link="Common\System\Net\System\Net\QuicLoad.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\LoopbackServer.cs"
              Link="Common\System\Net\Http\LoopbackServer.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\LoopbackServer.AuthenticationHelpers.cs"
diff --git a/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj b/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
index e00fd263ac15e6..72b596e6c809b4 100644
--- a/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
+++ b/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
@@ -7,6 +7,7 @@
     <EnableLibraryImportGenerator>true</EnableLibraryImportGenerator>
     <!-- the res/xml/network_security_config.xml file comes from the System.Net.TestData package -->
     <IncludeNetworkSecurityConfig Condition="'$(TargetOS)' == 'Android'">true</IncludeNetworkSecurityConfig>
+    <EnablePreviewFeatures>true</EnablePreviewFeatures>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AssemblyInfo.cs" />
@@ -73,6 +74,8 @@
              Link="Common\System\Net\HttpsTestClient.cs" />
     <Compile Include="$(CommonTestPath)System\Net\HttpsTestServer.cs"
              Link="Common\System\Net\HttpsTestServer.cs" />
+    <Compile Include="$(CommonTestPath)System\Net\QuicLoad.cs"
+             Link="Common\System\Net\System\Net\QuicLoad.cs" />
     <Compile Include="$(CommonTestPath)System\Net\SslProtocolSupport.cs"
              Link="Common\System\Net\SslProtocolSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Net\TestLogging.cs"