Danny is building a robot and planning to program a microcontroller. In which step is he following good programming practice?

Danny is building a robot and wants to program an Arduino microcontroller. He does not need to check the controller for connectors or cables, because all are supplied. He connects the controller to his computer, and he can use any programming language to program the board. Once he programs it, he connects the board to a robot body that is suspended off the ground for testing. He implements the code on the controller, but it does not work. So, he leaves the robot and the controller to run the code at their own pace.