If you are using TFS for source control: I don't have a template for this but you can follow below steps to achieve this.
In CI build set the Staging Location option to Copy buildoutput to following Source Control folder
Download the drop folder by mapping it in source settings option in build definition
Under drop location folder in TFS, every CI build will create a new folder, you need to pass this folder name to the second build definition. Please check another post from Jason for passing parameters to second build
Execute the tests by invoking the commandline tools using Invoke Process activity.