@mock.patch.object(systemconfig, 'GetDot1xInterfaces')
  def testGetMacAddressesWhenNoneFound(self, mock_gd1i):
    mock_gd1i.return_value = []
    self.assertEqual([], systemconfig.GetMacAddresses())
Test GetMacAddresses with none found.
dataset/ETHPy150Open google/macops/gmacpyutil/gmacpyutil/systemconfig_test.py/SysconfigModuleTest.testGetMacAddressesWhenNoneFound