Class GetNetworkInterfacesTest

app/network_test.py:131–171

class GetNetworkInterfacesTest(unittest.TestCase):

    def test_returns_empty_list_when_path_is_not_a_directory(self):
        with tempfile.NamedTemporaryFile() as mock_file:
            with mock.patch.object(network, '_INTERFACES_DIR', mock_file.name):
                self.assertEqual([], network.get_network_interfaces())

    def test_returns_empty_list_when_path_does_not_exist(self):
        with tempfile.TemporaryDirectory() as mock_dir:
            with mock.patch.object(network, '_INTERFACES_DIR',
                                   f'{mock_dir}/path/does/not/exist'):
                self.assertEqual([], network.get_network_interfaces())

    def test_returns_empty_list_when_directory_has_no_interfaces(self):
        with tempfile.TemporaryDirectory() as mock_dir:
            with mock.patch.object(network, '_INTERFACES_DIR', mock_dir):
                self.assertEqual([], network.get_network_interfaces())

    def test_excludes_loopback_and_virtual_interfaces(self):
        with tempfile.TemporaryDirectory() as mock_dir:
            mock_net_interfaces_dir = Path(mock_dir)
            # Physical interfaces (with 'device').
            (mock_net_interfaces_dir / 'eth0' / 'device').mkdir(parents=True)
            (mock_net_interfaces_dir / 'wlan0' / 'device').mkdir(parents=True)
            # Loopback (no 'device' in the path).
            (mock_net_interfaces_dir / 'lo').mkdir()
            # Some virtual interface (no 'device' in the path).
            (mock_net_interfaces_dir / 'veth0').mkdir()
            with mock.patch.object(network, '_INTERFACES_DIR', mock_dir):
                self.assertEqual(['eth0', 'wlan0'],
                                 network.get_network_interfaces())

    def test_returns_sorted_interface_names(self):
        with tempfile.TemporaryDirectory() as mock_dir:
            mock_net_interfaces_dir = Path(mock_dir)
            # Create in unsorted order.
            (mock_net_interfaces_dir / 'wlan0' / 'device').mkdir(parents=True)
            (mock_net_interfaces_dir / 'eth0' / 'device').mkdir(parents=True)
            with mock.patch.object(network, '_INTERFACES_DIR', mock_dir):
                self.assertEqual(['eth0', 'wlan0'],
                                 network.get_network_interfaces())