bump mocha dependency

actionpack/test/abstract_unit.rb

@@ -8,8 +8,8 @@ require 'yaml'
 require 'stringio'
 require 'test/unit'
 
-gem 'mocha', '>= 0.9.7'
-require 'mocha'
+gem 'mocha', '>= 0.13.1'
+require 'mocha/setup'
 
 begin
   require 'ruby-debug'

activemodel/test/test_helper.rb

@@ -1,8 +1,8 @@
 require 'rubygems'
 require 'test/unit'
 
-gem 'mocha', '>= 0.9.3'
-require 'mocha'
+gem 'mocha', '>= 0.13.1'
+require 'mocha/setup'
 
 require 'active_model'
 require 'active_model/state_machine'

activesupport/lib/active_support/test_case.rb

@@ -5,8 +5,8 @@ require 'active_support/testing/deprecation'
 require 'active_support/testing/declarative'
 
 begin
-  gem 'mocha', ">= 0.9.7"
-  require 'mocha'
+  gem 'mocha', ">= 0.13.1"
+  require 'mocha/setup'
 rescue LoadError
   # Fake Mocha::ExpectationError so we can rescue it in #run. Bleh.
   Object.const_set :Mocha, Module.new