Fix solution resolution for xplat on Helix

Author: John Luo

src/Servers/Kestrel/Kestrel/test/GeneratedCodeTests.cs

@@ -17,12 +17,12 @@ public class GeneratedCodeTests
         [Flaky("https://github.com/aspnet/AspNetCore-Internal/issues/2223", FlakyOn.Helix.All)]
         public void GeneratedCodeIsUpToDate()
         {
-            var repositoryRoot = typeof(GeneratedCodeTests).Assembly.GetCustomAttributes<AssemblyMetadataAttribute>().First(f => string.Equals(f.Key, "RepositoryRoot", StringComparison.OrdinalIgnoreCase)).Value;
+            var repositoryRoot = TestPathUtilities.GetSolutionRootDirectory("Kestrel");
 
-            var httpHeadersGeneratedPath = Path.Combine(repositoryRoot, "src/Servers/Kestrel/Core/src/Internal/Http/HttpHeaders.Generated.cs");
-            var httpProtocolGeneratedPath = Path.Combine(repositoryRoot, "src/Servers/Kestrel/Core/src/Internal/Http/HttpProtocol.Generated.cs");
-            var httpUtilitiesGeneratedPath = Path.Combine(repositoryRoot, "src/Servers/Kestrel/Core/src/Internal/Infrastructure/HttpUtilities.Generated.cs");
-            var transportConnectionGeneratedPath = Path.Combine(repositoryRoot, "src/Servers/Kestrel/Transport.Abstractions/src/Internal/TransportConnection.Generated.cs");
+            var httpHeadersGeneratedPath = Path.Combine(repositoryRoot, "Kestrel/Core/src/Internal/Http/HttpHeaders.Generated.cs");
+            var httpProtocolGeneratedPath = Path.Combine(repositoryRoot, "Kestrel/Core/src/Internal/Http/HttpProtocol.Generated.cs");
+            var httpUtilitiesGeneratedPath = Path.Combine(repositoryRoot, "Kestrel/Core/src/Internal/Infrastructure/HttpUtilities.Generated.cs");
+            var transportConnectionGeneratedPath = Path.Combine(repositoryRoot, "Kestrel/Transport.Abstractions/src/Internal/TransportConnection.Generated.cs");
 
             var testHttpHeadersGeneratedPath = Path.GetTempFileName();
             var testHttpProtocolGeneratedPath = Path.GetTempFileName();

src/Servers/Kestrel/Kestrel/test/Microsoft.AspNetCore.Server.Kestrel.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
@@ -9,11 +9,6 @@
     <Compile Include="$(KestrelSharedSourceRoot)test\*.cs" LinkBase="shared" />
     <Compile Include="$(SharedSourceRoot)test\SkipOnHelixAttribute.cs" />
     <Content Include="$(KestrelSharedSourceRoot)test\TestCertificates\*.pfx" LinkBase="shared\TestCertificates" CopyToOutputDirectory="PreserveNewest" />
-
-    <AssemblyAttribute Include="System.Reflection.AssemblyMetadataAttribute">
-      <_Parameter1>RepositoryRoot</_Parameter1>
-      <_Parameter2>$(RepositoryRoot)</_Parameter2>
-    </AssemblyAttribute>
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETFramework'">