refactor checking for a successful cancelation

Author: urfeex

ur_robot_driver/test/integration_test_trajectory_until.py

@@ -40,7 +40,6 @@
 
 from controller_manager_msgs.srv import SwitchController
 from ur_msgs.action import FollowJointTrajectoryUntil
-from action_msgs.srv import CancelGoal
 from trajectory_msgs.msg import JointTrajectory, JointTrajectoryPoint
 from builtin_interfaces.msg import Duration
 
@@ -159,4 +158,4 @@ def test_trajectory_until_can_cancel(self, tf_prefix, initial_joint_controller):
         )
         self.assertTrue(goal_handle.accepted)
         result = self._trajectory_until_interface.cancel_goal(goal_handle)
-        self.assertEqual(result.return_code, CancelGoal.ERROR_NONE)
+        self.assertTrue(len(result.goals_canceling) > 0)