[#4181] Require a Deliverable's title, type, and manager.

test/unit/deliverable_test.rb

@@ -3,4 +3,8 @@ require File.dirname(__FILE__) + '/../test_helper'
 class DeliverableTest < ActiveSupport::TestCase
   should_belong_to :contract
   should_belong_to :manager
+
+  should_validate_presence_of :title
+  should_validate_presence_of :type
+  should_validate_presence_of :manager
 end