assert_select in 2.3.0RC1 again

Hi,

updating to Rails 2.3 RC1 broke some of my functional tests, which all ran without errors in 2.2.2. Namely, the line

assert_select 'div#flash'

is now supposed to be false, while changing it to

# assert_select 'div#flash'
assert_match '<div class="subcolumns note" id="flash">', @response.body

turns out to be true.

I tried to trace it and found that response_from_page_or_rjs in selector_assertions.rb returns an empty root:

#<HTML::Node:0x3e87274 @position=0, @children=[], @line=0, @parent=nil>

while in 2.2.2 it correctly returned my whole document body as content of root.

I can, of course, simply rewrite my tests, but I was wondering whether this is an expected behavior.

Alex

BTW: Yes, I've seen #1890 Tests which use assert_select fail in 2.3.0 RC1 when upgrading an app and I'm not using ActiveMerhcant. I've temporarily disabled some plugins and updated the rest. Unfortunately with no effect.