Mocha VS SimpleDelegate

gistfile1.txt

                  user       system     total      real
mocha:            0.000000   0.000000   0.000000   (0.000277)
simple_delegator: 0.000000   0.000000   0.000000   (0.000024)

mocha_vs_simple_delegator.rb

require 'benchmark'
require 'delegate'
require 'mocha'

Benchmark.bm(10000) do |x|
  x.report :mocha do
    array = [1]
    array.expects(:push).with(2).returns([1, 2])
    array.push(2)
  end
  x.report :delegator do
    array = [1]
    mock  = Class.new(SimpleDelegator) { def push(*args); [1, 2]; end }.new(array)
    mock.push(2)
  end
end