test_rospy_exceptions.py

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#!/usr/bin/env python
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import os
import sys
import struct
import unittest
import time

class TestRospyExceptions(unittest.TestCase):

    def test_exceptions(self):
        # not really testing anything here other than typos
        from rospy.exceptions import ROSException, ROSSerializationException, ROSInternalException, ROSInitException, \
            TransportException, TransportTerminated, TransportInitError
        
        for e in [ROSException, ROSInitException, ROSSerializationException]:
            exc = e('foo')
            self.assert_(isinstance(exc, ROSException))
        for e in [ROSInternalException, 
                  TransportException, TransportTerminated, TransportInitError]:
            exc = e('foo')
            self.assert_(isinstance(exc, ROSInternalException))

    def test_ROSInterruptException(self):
        from rospy.exceptions import ROSInterruptException, ROSException
        try:
            raise ROSInterruptException("test")
        except ROSException:
            pass
        try:
            raise ROSInterruptException("test")
        except KeyboardInterrupt:
            pass

    def test_ROSTimeMovedBackwardsException(self):
        from rospy.exceptions import ROSTimeMovedBackwardsException, ROSInterruptException
        try:
            raise ROSTimeMovedBackwardsException(1.0)
        except ROSInterruptException as e:
            # ensure the message is not changed, because old code may check it
            self.assertEqual("ROS time moved backwards", e.message)
        try:
            time = 1.0
            raise ROSTimeMovedBackwardsException(time)
        except ROSTimeMovedBackwardsException as e:
            self.assertEqual(time, e.time)