You spend 15 minutes filling out a long configuration form. You get a Slack notification, switch tabs, reply to a colleague, and grab a coffee. 30 minutes later, you come back to the form and click "Save". The page flashes. The login screen appears...

Testing frontend error handling is a pain. You want to verify that your React/Vue app shows a nice "Retry" button when the API fails. Or you want to check if the Skeleton Loader looks good during a 10-second delay. The traditional way: Open Chrome ...

"It works on my machine." We've all said it. But does your bash script work when the third-party API takes 15 seconds to respond? Does your backend service gracefully handle a sudden spike of 503 errors from a payment provider? Writing a full mock ...