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import importlib

from unittest.mock import patch

import pytest

import can

from can.interfaces import BACKENDS

@pytest.fixture(params=(BACKENDS.keys()))

def constructor(request):

mod, cls = BACKENDS[request.param]

try:

module = importlib.import_module(mod)

constructor = getattr(module, cls)

except:

pytest.skip("Unable to load interface")

return constructor

@pytest.fixture

def interface(constructor):

class MockInterface(constructor):

def __init__(self):

pass

def __del__(self):

pass

return MockInterface()

@patch.object(can.bus.BusABC, "shutdown")

def test_interface_calls_parent_shutdown(mock_shutdown, interface):

try:

interface.shutdown()

except:

pass

finally:

mock_shutdown.assert_called()