Problem with functional tests and params

Hi all.

Problem: Using parameters in get() seems to swallow the session

In my functional test I have something like:
get :show, :testa => 'aa', :testb => 'bb'
In my view I have:
<%= session[:testb]%>

This should give a true for this test: assert_tag :content => "bb"

But it doesn't unless I remove the params when calling get(), so this
tests true:
get :show, {}, :testb => 'bb'
assert_tag :content => "bb"

What am I doing wrong ?
I'm using Rails version 1.1.6