lib/active_support/testing/mochaing.rb



begin
  silence_warnings { require 'mocha/setup' }
rescue LoadError
  # Fake Mocha::ExpectationError so we can rescue it in #run. Bleh.
  Object.const_set :Mocha, Module.new
  Mocha.const_set :ExpectationError, Class.new(StandardError)
end