    # File lib/active_support/testing/setup_and_teardown.rb, line 12
          def self.included(base)
            base.send :include, ActiveSupport::Callbacks
            base.define_callbacks :setup, :teardown

            begin
              require 'mocha'
              base.alias_method_chain :run, :callbacks_and_mocha
            rescue LoadError
              base.alias_method_chain :run, :callbacks
            end
          end