add C# testing APIs
diff --git a/src/csharp/build_packages_dotnetcli.bat b/src/csharp/build_packages_dotnetcli.bat
index 3b9306b..b99fdcb 100755
--- a/src/csharp/build_packages_dotnetcli.bat
+++ b/src/csharp/build_packages_dotnetcli.bat
@@ -59,6 +59,7 @@
 %DOTNET% restore . || goto :error
 
 %DOTNET% pack --configuration Release Grpc.Core\project.json --output ..\..\artifacts || goto :error
+%DOTNET% pack --configuration Release Grpc.Core.Testing\project.json --output ..\..\artifacts || goto :error
 %DOTNET% pack --configuration Release Grpc.Auth\project.json --output ..\..\artifacts || goto :error
 %DOTNET% pack --configuration Release Grpc.HealthCheck\project.json --output ..\..\artifacts || goto :error
 %DOTNET% pack --configuration Release Grpc.Reflection\project.json --output ..\..\artifacts || goto :error