Rostest in Python not subscribing to a topic

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Hi there,

I'm performing testing with rospy and rostest. I have some nodes running that are constantly publishing on a topic. But the subscribers I create inside the rostest are not able to connect to the topics. if run the same code in a normal node, it works perfectly but when I do it inside the rostest it is not able to received the topic. This is my code:

class TestRosComunication(unittest.TestCase):

    def test_robot_control(self):
        rospy.init_node("test_node")
        time.sleep(2)
        robot=RobotJointControl()

        while(robot.sub.get_num_connections()==0):
            rospy.sleep(1)
            rospy.loginfo("waiting for publishers")
        joints=robot.getCurrentJoints()

        print(joints)
        self.assertTrue(joints is not None)

   if __name__ == '__main__':
    import rostest

    rostest.rosrun(PKG, 'test_ros_test', TestRosComunication)

The subscriber is create in the constructor of RobotJointControl. And also when running the above code, and typing rosnode list the node test_node does not appear.