gistfile1.diff

diff --git a/activesupport/test/deprecation_test.rb b/activesupport/test/deprecation_test.rb
index 27b1dce..95740c0 100644
--- a/activesupport/test/deprecation_test.rb
+++ b/activesupport/test/deprecation_test.rb
@@ -31,6 +31,11 @@ class Deprecatee
   A = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('Deprecatee::A', 'Deprecatee::B::C')
 end
 
+class Rails
+  def self.backtrace_cleaner
+    ActiveSupport::BacktraceCleaner.new 
+  end
+end
 
 class DeprecationTest < ActiveSupport::TestCase
   def setup
@@ -110,7 +115,10 @@ class DeprecationTest < ActiveSupport::TestCase
 
   def test_assert_deprecation_backtrace_is_cleaned
     assert_deprecated(/called from test_assert_deprecation_backtrace_is_cleaned at (.)\/test\/deprecation_test.rb:(\d)/) do
-      ActiveSupport::Deprecation.warn 'abc'
+      stub = ActiveSupport::BacktraceCleaner.new
+      Rails.stubs(:backtrace_cleaner).returns(stub)
+      stub.expects(:clean)
+      ActiveSupport::Deprecation.warn('abc')
     end
   end