added more tests for update_column

activerecord/test/cases/associations/belongs_to_associations_test.rb

@@ -296,6 +296,15 @@ def test_belongs_to_counter_after_update_attributes
     assert_equal 1, Topic.find(topic.id)[:replies_count]
   end
 
+  def test_belongs_to_counter_when_update_column
+    topic = Topic.create!(:title => "37s")
+    topic.replies.create!(:title => "re: 37s", :content => "rails")
+    assert_equal 1, Topic.find(topic.id)[:replies_count]
+
+    topic.update_column(:content, "rails is wonderfull")
+    assert_equal 1, Topic.find(topic.id)[:replies_count]
+  end
+
   def test_assignment_before_child_saved
     final_cut = Client.new("name" => "Final Cut")
     firm = Firm.find(1)