1 files changed, 34 insertions, 0 deletions
diff --git a/activesupport/test/test_test.rb b/activesupport/test/test_test.rb
new file mode 100644
index 0000000000..63a44e9379
--- /dev/null
+++ b/activesupport/test/test_test.rb
@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/abstract_unit'
+
+class AssertDifferenceTest < Test::Unit::TestCase
+  
+  def setup
+    @object = Class.new { attr_accessor :num }.new    
+  end
+  
+  def test_assert_no_difference
+    @object.num = 0
+    
+    assert_no_difference @object, :num do
+      # ...
+    end
+      
+  end
+  def test_assert_difference
+    @object.num = 0
+    
+    
+    assert_difference @object, :num, +1 do
+      @object.num = 1
+    end
+      
+  end
+
+  def test_methods_available
+    
+    assert self.respond_to?(:assert_difference)
+    assert self.respond_to?(:assert_no_difference)
+    
+  end
+
+end