assert_template true when it should not be?

I have a HomeController that renders one of two templates for its index action based on whether or not the user is authenticated.

The template names are "index" and "authenticated_index".

If I assert_template "index" when testing both use cases assert_template returns true. I would not expect this as the templates are not the same and for authenticated users you are not getting the index controller but rather the atuhenticated_index controller.

From a review of the docs for assert_template am I correct in seeing that the code uses a string.match()? If this is true I could get many false positives if I only require the template rendered to "match" the string in my test as opposed to specifically ensure that the template I want is rendered.

Am I wrong in my expectations/assumptions?

--Michael