test_document.rb

    should "set updated_at on document update but leave created_at alone" do
      doc = @document.create(:first_name => 'John', :age => 27)
      old_created_at = doc.created_at
      old_updated_at = doc.updated_at
      sleep 1
      @document.update(doc._id, { :first_name => 'Johnny' })
      from_db = @document.find(doc.id)
      from_db.created_at.to_i.should == old_created_at.to_i
      from_db.updated_at.to_i.should_not == old_updated_at.to_i
    end