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"""
Test functions in `can.interfaces.socketcan.socketcan`.
"""
import unittest
try:
from unittest.mock import Mock
from unittest.mock import patch
from unittest.mock import call
except ImportError:
from mock import Mock
from mock import patch
from mock import call
import ctypes
from can.interfaces.socketcan.socketcan import bcm_header_factory
class SocketCANTest(unittest.TestCase):
def setUp(self):
self._ctypes_sizeof = ctypes.sizeof
self._ctypes_alignment = ctypes.alignment
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_32_bit_sizeof_long_4_alignof_long_4(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 32-bit platform (ex. Debian Stretch on i386), where:
* sizeof(long) == 4
* sizeof(long long) == 8
* alignof(long) == 4
* alignof(long long) == 4
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 4,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 4,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_32_bit_sizeof_long_4_alignof_long_8(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 32-bit platform (ex. Raspbian Stretch on armv7l), where:
* sizeof(long) == 4
* sizeof(long long) == 8
* alignof(long) == 4
* alignof(long long) == 8
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 8,
ctypes.c_long: 4,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
@patch("ctypes.sizeof")
@patch("ctypes.alignment")
def test_bcm_header_factory_64_bit_sizeof_long_4_alignof_long_4(
self, ctypes_sizeof, ctypes_alignment
):
"""This tests a 64-bit platform (ex. Ubuntu 18.04 on x86_64), where:
* sizeof(long) == 8
* sizeof(long long) == 8
* alignof(long) == 8
* alignof(long long) == 8
"""
def side_effect_ctypes_sizeof(value):
type_to_size = {
ctypes.c_longlong: 8,
ctypes.c_long: 8,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_size[value]
def side_effect_ctypes_alignment(value):
type_to_alignment = {
ctypes.c_longlong: 8,
ctypes.c_long: 8,
ctypes.c_uint8: 1,
ctypes.c_uint16: 2,
ctypes.c_uint32: 4,
ctypes.c_uint64: 8,
}
return type_to_alignment[value]
ctypes_sizeof.side_effect = side_effect_ctypes_sizeof
ctypes_alignment.side_effect = side_effect_ctypes_alignment
fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
BcmMsgHead = bcm_header_factory(fields)
expected_fields = [
("opcode", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("count", ctypes.c_uint32),
# We expect 4 bytes of padding
("pad_0", ctypes.c_uint8),
("pad_1", ctypes.c_uint8),
("pad_2", ctypes.c_uint8),
("pad_3", ctypes.c_uint8),
("ival1_tv_sec", ctypes.c_long),
("ival1_tv_usec", ctypes.c_long),
("ival2_tv_sec", ctypes.c_long),
("ival2_tv_usec", ctypes.c_long),
("can_id", ctypes.c_uint32),
("nframes", ctypes.c_uint32),
]
self.assertEqual(expected_fields, BcmMsgHead._fields_)
if __name__ == "__main__":
unittest.main()
|
