test_vm.py

        vm = VirtualMachine()

        def create_mock():
            vm._created = True
            vm.ip_addr = '192.168.0.1'

        with patch.object(vm, 'create', side_effect=create_mock):
            vm.create()

        vm.run('ls')
        ssh_command.assert_called_once_with('ls', hostname='192.168.0.1')