Post '/members/base/login'?

I wrote a test helper:

def login(user)
post ‘/members/login’, :email=>user.email, :password=>user.password

or

post ‘/members/base/login’, :email=>user.email,
:password=>user.password
end

Neither of these work. The test log shows weirdness for the action:

Parameters: {“action”=>"/members/base/login",
“controller”=>“members/base”, …

Or:

Parameters: {“action”=>"/members/login", “controller”=>“members/base”,

How can I get this to work?

Thanks,
Joe