Fix failed adds a new tag rule js test

spec/javascripts/unit/admin/tag_rules/controllers/tag_rules_controller_spec.js.coffee

@@ -15,6 +15,7 @@ describe "TagRulesCtrl", ->
 
     inject ($rootScope, $controller) ->
       scope = $rootScope
+      scope.enterprise_form = jasmine.createSpyObj('enterprise_form', ['$setDirty'])
       ctrl = $controller 'TagRulesCtrl', {$scope: scope, enterprise: enterprise}
 
   describe "tagGroup start indices", ->
@@ -27,6 +28,8 @@ describe "TagRulesCtrl", ->
       scope.addNewRuleTo(scope.tagGroups[0], "DiscountOrder")
 
     it "adds a new rule of the specified type to the rules array for the tagGroup", ->
+      expect(scope.enterprise_form.$setDirty).toHaveBeenCalled()
+
       expect(scope.tagGroups[0].rules.length).toEqual 3
       expect(scope.tagGroups[0].rules[2].type).toEqual "TagRule::DiscountOrder"