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#!/usr/bin/env python

"""

This module tests the context manager of Bus and Notifier classes

"""

import unittest

import can

class ContextManagerTest(unittest.TestCase):

def setUp(self):

data = [0, 1, 2, 3, 4, 5, 6, 7]

self.msg_send = can.Message(

is_extended_id=False, arbitration_id=0x100, data=data

)

def test_open_buses(self):

with can.Bus(interface="virtual") as bus_send, can.Bus(

interface="virtual"

) as bus_recv:

bus_send.send(self.msg_send)

msg_recv = bus_recv.recv()

# Receiving a frame with data should evaluate msg_recv to True

self.assertTrue(msg_recv)

def test_use_closed_bus(self):

with can.Bus(interface="virtual") as bus_send, can.Bus(

interface="virtual"

) as bus_recv:

bus_send.send(self.msg_send)

# Receiving a frame after bus has been closed should raise a CanException

self.assertRaises(can.CanError, bus_recv.recv)

self.assertRaises(can.CanError, bus_send.send, self.msg_send)

if __name__ == "__main__":

unittest.main()