1 files changed, 12 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/blank_test.rb b/activesupport/test/core_ext/blank_test.rb
index 0fce470fd5..76a0b39978 100644
--- a/activesupport/test/core_ext/blank_test.rb
+++ b/activesupport/test/core_ext/blank_test.rb
@@ -3,9 +3,21 @@ require File.dirname(__FILE__) + '/../abstract_unit'
 class BlankTest < Test::Unit::TestCase
   BLANK = [nil, false, '', '   ', "  \n\t  \r ", [], {}]
   NOT   = [true, 0, 1, 'a', [nil], { nil => 0 }]
+  
+  class EmptyObject
+    def empty?
+      true
+    end
+    alias :strip :empty?
+  end
+  class NoStripObject < EmptyObject; undef :strip; end
+  class NoEmptyStripObject < NoStripObject; undef :empty?; end
 
   def test_blank
     BLANK.each { |v| assert v.blank?  }
     NOT.each   { |v| assert !v.blank? }
+    assert EmptyObject.new.blank?
+    assert NoStripObject.new.blank?
+    assert !NoEmptyStripObject.new.blank?
   end
 end