Copy precompiled pdb to publish directory

Fixes #98

src/Microsoft.AspNetCore.Mvc.Razor.ViewCompilation/build/common.targets

@@ -57,6 +57,10 @@
     AfterTargets="ComputeRefAssembliesToPublish"
     Condition="'$(MvcRazorCompileOnPublish)'=='true'">
 
+    <PropertyGroup>
+      <_MvcRazorOutputPdbFullPath>$([System.IO.Path]::ChangeExtension('$(_MvcRazorOutputFullPath)', '.pdb'))</_MvcRazorOutputPdbFullPath>
+    </PropertyGroup>
+
     <ItemGroup>
       <ResolvedFileToPublish
           Remove="%(MvcRazorFilesToCompile.FullPath)"
@@ -65,6 +69,10 @@
       <ResolvedFileToPublish Include="$(_MvcRazorOutputFullPath)" CopyToPublishDirectory="Always">
         <RelativePath>$([System.IO.Path]::GetFileName('$(_MvcRazorOutputFullPath)'))</RelativePath>
       </ResolvedFileToPublish>
+
+      <ResolvedFileToPublish Include="$(_MvcRazorOutputPdbFullPath)" CopyToPublishDirectory="Always">
+        <RelativePath>$([System.IO.Path]::GetFileName('$(_MvcRazorOutputPdbFullPath)'))</RelativePath>
+      </ResolvedFileToPublish>
     </ItemGroup>
 
     <ItemGroup Condition="'$(MvcRazorExcludeRefAssembliesFromPublish)'=='true'">

test/FunctionalTests/ViewCompilationOptionsTest.cs

@@ -52,6 +52,20 @@ namespace FunctionalTests
             }
         }
 
+        [ConditionalTheory]
+        [MemberData(nameof(SupportedFlavorsTheoryData))]
+        public async Task Precompilation_PublishesPdbsToOutputDirectory(RuntimeFlavor flavor)
+        {
+            // Arrange
+            using (var deployment = await Fixture.CreateDeploymentAsync(flavor))
+            {
+                var pdbPath = Path.Combine(deployment.DeploymentResult.ContentRoot, Fixture.ApplicationName + ".PrecompiledViews.pdb");
+
+                // Act & Assert
+                Assert.True(File.Exists(pdbPath), $"PDB at {pdbPath} was not found.");
+            }
+        }
+
         public class TestFixture : ApplicationTestFixture
         {
             public TestFixture()