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test_slcan.py
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142 lines (116 loc) · 4.76 KB
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#!/usr/bin/env python
import unittest
import can
from .config import IS_PYPY
"""
Mentioned in #1010 & #1490
> PyPy works best with pure Python applications. Whenever you use a C extension module,
> it runs much slower than in CPython. The reason is that PyPy can't optimize C extension modules since they're not fully supported.
> In addition, PyPy has to emulate reference counting for that part of the code, making it even slower.
https://realpython.com/pypy-faster-python/#it-doesnt-work-well-with-c-extensions
"""
TIMEOUT = 0.5 if IS_PYPY else 0.001 # 0.001 is the default set in slcanBus
class slcanTestCase(unittest.TestCase):
def setUp(self):
self.bus = can.Bus(
"loop://", interface="slcan", sleep_after_open=0, timeout=TIMEOUT
)
self.serial = self.bus.serialPortOrig
self.serial.read(self.serial.in_waiting)
def tearDown(self):
self.bus.shutdown()
def test_recv_extended(self):
self.serial.write(b"T12ABCDEF2AA55\r")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
self.assertEqual(msg.arbitration_id, 0x12ABCDEF)
self.assertEqual(msg.is_extended_id, True)
self.assertEqual(msg.is_remote_frame, False)
self.assertEqual(msg.dlc, 2)
self.assertSequenceEqual(msg.data, [0xAA, 0x55])
def test_send_extended(self):
msg = can.Message(
arbitration_id=0x12ABCDEF, is_extended_id=True, data=[0xAA, 0x55]
)
self.bus.send(msg)
data = self.serial.read(self.serial.in_waiting)
self.assertEqual(data, b"T12ABCDEF2AA55\r")
def test_recv_standard(self):
self.serial.write(b"t4563112233\r")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
self.assertEqual(msg.arbitration_id, 0x456)
self.assertEqual(msg.is_extended_id, False)
self.assertEqual(msg.is_remote_frame, False)
self.assertEqual(msg.dlc, 3)
self.assertSequenceEqual(msg.data, [0x11, 0x22, 0x33])
def test_send_standard(self):
msg = can.Message(
arbitration_id=0x456, is_extended_id=False, data=[0x11, 0x22, 0x33]
)
self.bus.send(msg)
data = self.serial.read(self.serial.in_waiting)
self.assertEqual(data, b"t4563112233\r")
def test_recv_standard_remote(self):
self.serial.write(b"r1238\r")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
self.assertEqual(msg.arbitration_id, 0x123)
self.assertEqual(msg.is_extended_id, False)
self.assertEqual(msg.is_remote_frame, True)
self.assertEqual(msg.dlc, 8)
def test_send_standard_remote(self):
msg = can.Message(
arbitration_id=0x123, is_extended_id=False, is_remote_frame=True, dlc=8
)
self.bus.send(msg)
data = self.serial.read(self.serial.in_waiting)
self.assertEqual(data, b"r1238\r")
def test_recv_extended_remote(self):
self.serial.write(b"R12ABCDEF6\r")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
self.assertEqual(msg.arbitration_id, 0x12ABCDEF)
self.assertEqual(msg.is_extended_id, True)
self.assertEqual(msg.is_remote_frame, True)
self.assertEqual(msg.dlc, 6)
def test_send_extended_remote(self):
msg = can.Message(
arbitration_id=0x12ABCDEF, is_extended_id=True, is_remote_frame=True, dlc=6
)
self.bus.send(msg)
data = self.serial.read(self.serial.in_waiting)
self.assertEqual(data, b"R12ABCDEF6\r")
def test_partial_recv(self):
self.serial.write(b"T12ABCDEF")
msg = self.bus.recv(TIMEOUT)
self.assertIsNone(msg)
self.serial.write(b"2AA55\rT12")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
self.assertEqual(msg.arbitration_id, 0x12ABCDEF)
self.assertEqual(msg.is_extended_id, True)
self.assertEqual(msg.is_remote_frame, False)
self.assertEqual(msg.dlc, 2)
self.assertSequenceEqual(msg.data, [0xAA, 0x55])
msg = self.bus.recv(TIMEOUT)
self.assertIsNone(msg)
self.serial.write(b"ABCDEF2AA55\r")
msg = self.bus.recv(TIMEOUT)
self.assertIsNotNone(msg)
def test_version(self):
self.serial.write(b"V1013\r")
hw_ver, sw_ver = self.bus.get_version(0)
self.assertEqual(hw_ver, 10)
self.assertEqual(sw_ver, 13)
hw_ver, sw_ver = self.bus.get_version(0)
self.assertIsNone(hw_ver)
self.assertIsNone(sw_ver)
def test_serial_number(self):
self.serial.write(b"NA123\r")
sn = self.bus.get_serial_number(0)
self.assertEqual(sn, "A123")
sn = self.bus.get_serial_number(0)
self.assertIsNone(sn)
if __name__ == "__main__":
unittest.main()