test_one_message.py

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#!/usr/bin/env python
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import unittest
import rospy
import rostest
import sys
from std_msgs.msg import *

class LatchedSub(unittest.TestCase):

  def msg_cb(self, msg):
    self.success = True


  def test_latched_sub(self):
    rospy.init_node('random_sub')

    self.success = False

    sub = rospy.Subscriber("output", String, self.msg_cb)

    while not self.success:
      rospy.sleep(rospy.Duration.from_sec(0.5))

    self.assertEqual(self.success, True)

if __name__ == '__main__':
  rostest.rosrun('rosbag', 'latched_sub', LatchedSub, sys.argv)