Merge pull request #4010 from arunagw/fix_test_activemodel

Fixed test "ArgumentError: wrong number of arguments(1 for 0)"

activemodel/test/cases/validations/validates_test.rb

@@ -18,7 +18,7 @@ class ValidatesTest < ActiveModel::TestCase
 
   def test_validates_with_messages_empty
     Person.validates :title, :presence => {:message => "" }
-    person = Person.new(:title => '')
+    person = Person.new
     assert !person.valid?, 'person should not be valid.'
   end