The React-Testing-Diagram part you provided as reference is cut off and cannot be seen. I am using macOS as my operating system. I was thinking about using only one of the two, msw and the created server. Since both were used in parallel, I was confused because there were many problems between msw and the created server among the parts where errors occurred. Lastly, if you made a mistake in the lecture, I think it would be much better to specify what you made a mistake at the time on the timeline.