2 files changed, 21 insertions, 5 deletions
diff --git a/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb b/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb
index f5f0ef8779..368317df9b 100644
--- a/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb
+++ b/activesupport/lib/active_support/core_ext/class/delegating_attributes.rb
@@ -19,6 +19,12 @@ class Class
       def #{name}
         self.class.#{name}
       end
+      def self.#{name}?
+        !!#{name}
+      end
+      def #{name}?
+        !!#{name}
+      end
       EOS
     end
   end
@@ -37,4 +43,4 @@ class Class
     superclass_delegating_reader(*names)
     superclass_delegating_writer(*names)
   end
-end
-\ No newline at end of file
+end
diff --git a/activesupport/test/core_ext/class/delegating_attributes_test.rb b/activesupport/test/core_ext/class/delegating_attributes_test.rb
index fa605e6d19..8fc08a0250 100644
--- a/activesupport/test/core_ext/class/delegating_attributes_test.rb
+++ b/activesupport/test/core_ext/class/delegating_attributes_test.rb
@@ -25,7 +25,9 @@ class DelegatingAttributesTest < Test::Unit::TestCase
     # The class and instance should have an accessor, but there
     # should be no mutator
     assert single_class.respond_to?(:only_reader)
+    assert single_class.respond_to?(:only_reader?)
     assert single_class.public_instance_methods.map(&:to_s).include?("only_reader")
+    assert single_class.public_instance_methods.map(&:to_s).include?("only_reader?")
     assert !single_class.respond_to?(:only_reader=)
   end
 
@@ -51,9 +53,17 @@ class DelegatingAttributesTest < Test::Unit::TestCase
 
   def test_working_with_simple_attributes
     single_class.superclass_delegating_accessor :both
-    single_class.both= "HMMM"
+
+    single_class.both = "HMMM"
+
     assert_equal "HMMM", single_class.both
+    assert_equal true, single_class.both?
+
     assert_equal "HMMM", single_class.new.both
+    assert_equal true, single_class.new.both?
+
+    single_class.both = false
+    assert_equal false, single_class.both?
   end
 
   def test_working_with_accessors
@@ -73,14 +83,14 @@ class DelegatingAttributesTest < Test::Unit::TestCase
     parent = Class.new
     parent.superclass_delegating_accessor :both
     child = Class.new(parent)
-    parent.both= "1"
+    parent.both = "1"
     assert_equal "1", child.both
 
-    child.both="2"
+    child.both = "2"
     assert_equal "1", parent.both
     assert_equal "2", child.both
 
-    parent.both="3"
+    parent.both = "3"
     assert_equal "3", parent.both
     assert_equal "2", child.both
   end