Rails4 and ActionMailer::Base.deliveries

Can someone who is working with Rais 4 verify
if ActionMailer::Base.deliveries returning valid data or an empty set?
looking at the ActiveMailer source code and changelog and nothing jumps
at me.

This is with the same code and configuration that worked for me in Rails
3.x but now with Rails 4.0.0.beta1 and Ruby 1.9.3p374. delivery_method
set to :test in both my development and test configuration files. The
of ActionMailer seems to be working.

Thank you