How do i specify Visual Studio test runner in tfs build script

I have used Microsoft shims in my project for writing unit tests. These tests run fine on my local machine, however when build on server the tests fail as the ms test runner does not support shims. After searching alot i found that i have to specify vs test runner to run test but it can be specified only in default template. Is there any way to specify the test runner in build script file. I am using TFS 2013 on TFS server with upgrade template.