'Test set_interface_mac with an valid MAC address to simulate
normal operation'

@mock.patch('wifiphisher.common.interfaces.pyw')
def test_set_interface_mac_valid_mac_none(self, pyw):

    interface_name = 'wlan0'
    interface_object = 'Card    Object'
    mac_address = '11:22:33:44:55:66'
    adapter = interfaces.NetworkAdapter(interface_name, interface_object, self.mac_address)
    self.network_manager._name_to_object[interface_name] = adapter
    self.network_manager._active.add(interface_name)
    operation = self.network_manager.set_interface_mac(interface_name, mac_address)
    message = 'Failed    when    a    valid    mac    address    was    provided'
    self.assertIsNone(operation, message)
