Mocha teardown hook not being fired by Rspec?

foo_spec.rb

require "bundler/setup"

RSpec.configure do |config|
  config.mock_framework = :mocha
end

class Foo
  def self.bar; end
end

describe Foo do
  it "bar 1" do
    Foo.expects(:bar)
    Foo.bar
  end

  it "bar 2" do
    Foo.bar
  end
end

Gemfile

source :rubygems

gem 'rspec', '2.8.0'
gem 'mocha', '0.10.4'

$ ruby -v
ruby 1.8.7 (2011-06-30 patchlevel 352) [i686-darwin11.0.1]

$ bundle list
Gems included by the bundle:
  * bundler (1.0.21)
  * diff-lcs (1.1.3)
  * metaclass (0.0.1)
  * mocha (0.10.4)
  * rspec (2.8.0)
  * rspec-core (2.8.0)
  * rspec-expectations (2.8.0)
  * rspec-mocks (2.8.0)

$ rspec foo_spec.rb
..

Finished in 0.00063 seconds
2 examples, 0 failures