what is the folder tree vendor/rails/... for?

Hi all,

I have been trying to work out why a set of functional tests have been failing in a RoR book project I have been following (in Patrick Lenz's book BYORORWA). I have discovered that in the sample application there is a set of folders starting with vendor/rails/... This set of folders is not created when I create a new project using "rails
[nameofproject]" and it is not in any of my old RoR projects either. However, if I put that folder tree in my application the functional tests all pass.
Also, removing the tree from the sample application causes it to fail
with the exact same failures and errors that I had in my version of the application. So it seems pretty certain that the absence of these folders makes the functional tests fails.

Can anyone tell me whether my Rails installation should be creating
this folder tree in my own projects, and it would be great to know what the folder tree actually does.

Thanks,

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