[go-nuts] How to properly test a web api?

I have a web app I would like to do regression testing on at build time.
I've read the documentation at https://golang.org/doc/code.html on testing,
but I'm wondering how you would do something like mock a HTTP or DB
connection.
I'm sure there is a way to do this without creating custom mock objects for
everything, but I'm not seeing any information on the topic.

For example. I have certain pathways that should be only available to
logged in users. Logged in would mean that we have attached a "user"
object to the session store for that request.
I check for a user object at the top of every protected route and I return
an http error code if there isn't once..

I'd really rather not write my own mocks for request & response, and I
can't seem to find a way to "fake one" by directly invoking it such as.

req := http.Request{}

Ideas?

Thanks!