topic_count.py

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#!/usr/bin/env python
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import roslib
roslib.load_manifest('rosbag')

import unittest
import rostest
import sys
import time
import subprocess

class TopicCount(unittest.TestCase):

  def test_topic_count(self):
    # Wait while the recorder creates a bag for us to examine
    time.sleep(10.0)

    # Check the topic count returned by `rosbag info`
    # We could probably do this through the rosbag Python API...
    cmd = ['rosbag', 'info', 
           '/tmp/test_rosbag_record_one_publisher_two_topics.bag',
           '-y', '-k', 'topics']
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out,err = p.communicate()
    topic_count = 0
    for l in out.decode().split('\n'):
        f = l.strip().split(': ')
        if len(f) == 2 and f[0] == '- topic':
            topic_count += 1

    self.assertEqual(topic_count, 2)

if __name__ == '__main__':
  rostest.unitrun('test_rosbag', 'topic_count', TopicCount, sys.argv)