Time to_s

# In 1.9 the Time#to_s method doesn't return in the format as outlined in the pickaxe book (PDF page 747):

it "ouput of #to_s is different in 1.8 and 1.9" do
  time = Time.at(1289349987)
  time.strftime("%a %b %d %H:%M:%S %z %Y").should eql('Wed Nov 10 01:46:27 +0100 2010') # passes
  time.to_s.should eql('Wed Nov 10 01:46:27 +0100 2010') # fails
end

# Failure/Error: time.to_s.should eql('Wed Nov 10 01:46:27 +0100 2010')
#  expected "Wed Nov 10 01:46:27 +0100 2010"
#             got "2010-11-10 01:46:27 +0100"

# 
# ruby -e 'puts Time.at(1289349987).to_s' # should return "Wed Nov 10 01:46:27 +0100 2010"
# 
# 'correct' in :
# - ruby-1.8.7-8378
# - jruby-1.5.3
# - rbx-1.1.0

# 'failed' in:
# - ruby-1.9.1-p378
# - ruby-1.9.2-p0
# - ruby-1.9.2-p180

# From the rubydoc (http://www.ruby-doc.org/core/classes/Time.html)
# 
# Returns a string representing time. Equivalent to calling Time#strftime with a format string of 
# ``%Y-%m-%d %H:%M:%S %z’’ for a local time and ``%Y-%m-%d %H:%M:%S UTC’’ for a UTC time.
#
#   Time.now.to_s       #=> "2007-10-05 16:09:51 +0900"
#   Time.now.utc.to_s   #=> "2007-10-05 07:09:51 UTC"
#