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#!/usr/bin/env python
"""
Tests helpers in `can.interfaces.socketcan.socketcan_common`.
"""
import unittest
from pathlib import Path
from unittest import mock
from can.interfaces.socketcan.utils import error_code_to_str, find_available_interfaces
from .config import IS_LINUX, TEST_INTERFACE_SOCKETCAN
class TestSocketCanHelpers(unittest.TestCase):
@unittest.skipUnless(IS_LINUX, "socketcan is only available on Linux")
def test_error_code_to_str(self):
"""
Check that the function does not crash & always
returns at least one character.
"""
# all possible & also some invalid error codes
test_data = list(range(0, 256)) + [-1, 256, 5235, 346264, None]
for error_code in test_data:
string = error_code_to_str(error_code)
self.assertTrue(string) # not None or empty
@unittest.skipUnless(
TEST_INTERFACE_SOCKETCAN, "socketcan is only available on Linux"
)
def test_find_available_interfaces(self):
result = find_available_interfaces()
self.assertGreaterEqual(len(result), 3)
self.assertIn("vcan0", result)
self.assertIn("vxcan0", result)
self.assertIn("slcan0", result)
def test_find_available_interfaces_w_patch(self):
# Contains lo, eth0, wlan0, vcan0, mycustomCan123
ip_output = (Path(__file__).parent / "data" / "ip_link_list.json").read_text()
with mock.patch("subprocess.check_output") as check_output:
check_output.return_value = ip_output
with mock.patch("sys.platform", "linux"):
ifs = find_available_interfaces()
self.assertEqual(["vcan0", "mycustomCan123"], ifs)
def test_find_available_interfaces_exception(self):
with mock.patch("subprocess.check_output") as check_output:
check_output.return_value = "<h1>Not JSON</h1>"
result = find_available_interfaces()
self.assertEqual([], result)
check_output.side_effect = Exception("Something went wrong :-/")
result = find_available_interfaces()
self.assertEqual([], result)
if __name__ == "__main__":
unittest.main()
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