diff --git a/test/Microsoft.AspNetCore.Razor.Design.Test/IntegrationTests/MSBuildIntegrationTestBase.cs b/test/Microsoft.AspNetCore.Razor.Design.Test/IntegrationTests/MSBuildIntegrationTestBase.cs
index 60bc033cf7..22e66f05ee 100644
--- a/test/Microsoft.AspNetCore.Razor.Design.Test/IntegrationTests/MSBuildIntegrationTestBase.cs
+++ b/test/Microsoft.AspNetCore.Razor.Design.Test/IntegrationTests/MSBuildIntegrationTestBase.cs
@@ -67,6 +67,9 @@ namespace Microsoft.AspNetCore.Razor.Design.IntegrationTests
                 // Disable node-reuse. We don't want msbuild processes to stick around
                 // once the test is completed.
                 "/nr:false",
+
+                // Let the test app know it is running as part of a test.
+                "/p:RunningAsTest=true",
             };
 
             if (!suppressRestore)
diff --git a/test/testapps/AppWithP2PReference/AppWithP2PReference.csproj b/test/testapps/AppWithP2PReference/AppWithP2PReference.csproj
index c15d826f9f..16771424d6 100644
--- a/test/testapps/AppWithP2PReference/AppWithP2PReference.csproj
+++ b/test/testapps/AppWithP2PReference/AppWithP2PReference.csproj
@@ -15,6 +15,11 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <!-- Test Placeholder -->
 
   <ItemGroup>
diff --git a/test/testapps/ClassLibrary/ClassLibrary.csproj b/test/testapps/ClassLibrary/ClassLibrary.csproj
index fc5b647326..6272fc2497 100644
--- a/test/testapps/ClassLibrary/ClassLibrary.csproj
+++ b/test/testapps/ClassLibrary/ClassLibrary.csproj
@@ -21,6 +21,11 @@
     <Description>ClassLibrary Description</Description>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <!-- Test Placeholder -->
 
   <Import Project="$(SolutionRoot)src\Microsoft.AspNetCore.Mvc.Razor.Extensions\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.Extensions.targets" />
diff --git a/test/testapps/ClassLibrary2/ClassLibrary2.csproj b/test/testapps/ClassLibrary2/ClassLibrary2.csproj
index 110d5df467..5a75754ff9 100644
--- a/test/testapps/ClassLibrary2/ClassLibrary2.csproj
+++ b/test/testapps/ClassLibrary2/ClassLibrary2.csproj
@@ -15,6 +15,11 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
+
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
   
   <ItemGroup>
     <ProjectReference Include="..\ClassLibrary\ClassLibrary.csproj" />
diff --git a/test/testapps/LargeProject/LargeProject.csproj b/test/testapps/LargeProject/LargeProject.csproj
index db5a44c5c5..d9294ef631 100644
--- a/test/testapps/LargeProject/LargeProject.csproj
+++ b/test/testapps/LargeProject/LargeProject.csproj
@@ -16,6 +16,11 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <!-- Test Placeholder -->
 
   <Import Project="$(SolutionRoot)src\Microsoft.AspNetCore.Mvc.Razor.Extensions\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.Extensions.targets" />
diff --git a/test/testapps/SimpleMvc/SimpleMvc.csproj b/test/testapps/SimpleMvc/SimpleMvc.csproj
index 021c90eaa2..de6a1dd665 100644
--- a/test/testapps/SimpleMvc/SimpleMvc.csproj
+++ b/test/testapps/SimpleMvc/SimpleMvc.csproj
@@ -16,6 +16,11 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <!-- Test Placeholder -->
 
   <Import Project="$(SolutionRoot)src\Microsoft.AspNetCore.Mvc.Razor.Extensions\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.Extensions.targets" />
diff --git a/test/testapps/SimpleMvcFSharp/SimpleMvcFSharp.fsproj b/test/testapps/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
index ec09cf7a67..27a307f6d6 100644
--- a/test/testapps/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
+++ b/test/testapps/SimpleMvcFSharp/SimpleMvcFSharp.fsproj
@@ -16,6 +16,11 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <ItemGroup>
     <Compile Include="Models/ErrorViewModel.fs" />
     <Compile Include="Program.fs" />
diff --git a/test/testapps/SimplePages/SimplePages.csproj b/test/testapps/SimplePages/SimplePages.csproj
index db5a44c5c5..d9294ef631 100644
--- a/test/testapps/SimplePages/SimplePages.csproj
+++ b/test/testapps/SimplePages/SimplePages.csproj
@@ -16,6 +16,11 @@
     <TargetFramework>netcoreapp2.2</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RunningAsTest)' == ''">
+    <!-- We don't want to run build server when not running as tests. -->
+    <UseRazorBuildServer>false</UseRazorBuildServer>
+  </PropertyGroup>
+
   <!-- Test Placeholder -->
 
   <Import Project="$(SolutionRoot)src\Microsoft.AspNetCore.Mvc.Razor.Extensions\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.Extensions.targets" />