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diff --git a/vendor/rails/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb b/vendor/rails/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb
new file mode 100644
index 0000000..e5853bf
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/testing/core_ext/test/unit/assertions.rb
@@ -0,0 +1,72 @@
+require 'test/unit/assertions'
+module Test
+  module Unit
+    #--
+    # FIXME: no Proc#binding in Ruby 2, must change this API
+    #++
+    module Assertions
+      # Test numeric difference between the return value of an expression as a result of what is evaluated
+      # in the yielded block.
+      #
+      #   assert_difference 'Article.count' do
+      #     post :create, :article => {...}
+      #   end
+      #
+      # An arbitrary expression is passed in and evaluated.
+      #
+      #   assert_difference 'assigns(:article).comments(:reload).size' do
+      #     post :create, :comment => {...}
+      #   end
+      #
+      # An arbitrary positive or negative difference can be specified. The default is +1.
+      #
+      #   assert_difference 'Article.count', -1 do
+      #     post :delete, :id => ...
+      #   end
+      #
+      # An array of expressions can also be passed in and evaluated.
+      #
+      #   assert_difference [ 'Article.count', 'Post.count' ], +2 do
+      #     post :create, :article => {...}
+      #   end
+      #
+      # A error message can be specified.
+      #
+      #   assert_difference 'Article.count', -1, "An Article should be destroyed" do
+      #     post :delete, :id => ...
+      #   end
+      def assert_difference(expressions, difference = 1, message = nil, &block)
+        expression_evaluations = Array(expressions).map do |expression|
+          [expression, lambda do
+            eval(expression, block.__send__(:binding))
+          end]
+        end
+
+        original_values = expression_evaluations.inject([]) { |memo, expression| memo << expression[1].call }
+        yield
+        expression_evaluations.each_with_index do |expression, i|
+          full_message = ""
+          full_message << "#{message}.\n" if message
+          full_message << "<#{expression[0]}> was the expression that failed"
+          assert_equal original_values[i] + difference, expression[1].call, full_message
+        end
+      end
+
+      # Assertion that the numeric result of evaluating an expression is not changed before and after
+      # invoking the passed in block.
+      #
+      #   assert_no_difference 'Article.count' do
+      #     post :create, :article => invalid_attributes
+      #   end
+      #
+      # A error message can be specified.
+      #
+      #   assert_no_difference 'Article.count', "An Article should not be destroyed" do
+      #     post :create, :article => invalid_attributes
+      #   end
+      def assert_no_difference(expressions, message = nil, &block)
+        assert_difference expressions, 0, message, &block
+      end
+    end
+  end
+end