Testing how a React build responds to a single label edit

The guide proposes comparing a build run with no source changes against one run after a small React label edit, so the two results answer different questions. It recommends using a visible change, such as a button label, so the output can be checked directly rather than relying on timing alone. Developers are told to add a distinct build script without replacing existing ones, record package versions, and run the build twice with retained local state. The edited output is then served locally and the button text is inspected to confirm the change appeared. The article also cautions that cached responses or task-runner restores can make a stale label appear, so the served directory and browser caching should be checked before drawing conclusions.