callback not working

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Hello Everyone, I have problem with my subscriber my code is as bellow, the problem is that, the callback function is not executed, and I cannot see the topic /test in my topic list. Thank you so much in advance.

Best,

def callback(msg):

    print("in callback right")
    position_right[0] = msg.pose.position.x
    position_right[1] = msg.pose.position.y
    position_right[2] = msg.pose.position.z
    print "position_x = %s" % position_right[0]
    orientation_right[0] = msg.pose.orientation.x
    orientation_right[1] = msg.pose.orientation.y
    orientation_right[2] = msg.pose.orientation.z
    orientation_right[3] = msg.pose.orientation.w
    pub = rospy.Publisher('/test', Float32 , queue_size=10)
    pub.publish('orientation_right')
def listener():
    rospy.init_node('listener', anonymous=True)
    print("in sub***************")
    rospy.Subscriber("robot/limb/right/endpoint_state",EndEffectorState, callback)
if __name__ == '__main__':
    listener()
    rospy.spin()