test_pubsub_order.py

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#!/usr/bin/env python
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from __future__ import print_function
 
PKG = 'test_rospy'
NAME = 'test_pubsub_order'
 
import sys 
import time
import unittest
 
import rospy
import rostest
from std_msgs.msg import String
 
PUBTOPIC = "chatter"
LPNODE = 'listenerpublisher'
LPTOPIC = 'listenerpublisher'
MSG = String
 
TIMEOUT = 10.0 #seconds
 
class TestPubSubOrder(unittest.TestCase):
 
    def setUp(self):
        self.callback_data = None
        
    def _test_subscriber_first_callback(self, data):
        self.callback_data = data
    
    
    def test_subscriber_first(self):
        self.assertTrue(self.callback_data is None, "invalid test fixture")
 
        # wait at most 5 seconds for listenerpublisher to be registered
        timeout_t = time.time() + 5.0
        while not rostest.is_subscriber(
            rospy.resolve_name(PUBTOPIC),
            rospy.resolve_name(LPNODE)) and time.time() < timeout_t:
            time.sleep(0.1)
 
        self.assertTrue(rostest.is_subscriber(
            rospy.resolve_name(PUBTOPIC),
            rospy.resolve_name(LPNODE)), "%s is not up"%LPNODE)
        
        print("Publishing to ", PUBTOPIC)
        pub = rospy.Publisher(PUBTOPIC, MSG, queue_size=0)
        rospy.Subscriber(LPTOPIC, MSG, self._test_subscriber_first_callback) 
 
        # publish about 10 messages for fun
        import random
        val = random.randint(0, 109812312)
        msg = "hi [%s]"%val
        for i in range(0, 10):
            pub.publish(MSG(msg))
            time.sleep(0.1)
 
        # listenerpublisher is supposed to repeat our messages back onto /listenerpublisher,
        # make sure we got it
        self.assertTrue(self.callback_data is not None, "no callback data from listenerpublisher")
        self.assertEqual(msg, self.callback_data.data, "callback data from listenerpublisher does not match")
        
if __name__ == '__main__':
    rospy.init_node(NAME)
    rostest.run(PKG, NAME, TestPubSubOrder, sys.argv)