Microsoft.VisualStudio.TestTools.WebStress.WebTestSuite

I am looking for this object:

Microsoft.VisualStudio.TestTools.WebStress.WebTestSuite

I can't seem to find it anywhere.

I am working in the VS2012 SDK and I know this object does exist because it is used internally.

I have looked all over the web for information on this, but there is none.

Thanks ahead.