I would love "real" specifications. But right now I'm already dealing with a boss that has no idea what he wants in terms of the UI. Simultaneously demanding I

I would love "real" specifications. But right now I'm already dealing with a boss that has no idea what he wants in terms of the UI. Simultaneously demanding I "know" what should be done without "taking on things nobody asked for." Alas, I don't work at NASA where these formalities exist. I'm given a rough sketch that I'm expected to bring into life, throw away and recreate again on a whim. Please note that I am not complaining, nor excusing. Only pointing out that our expectations, environments, and programming languages are different. Each can massively affect how the program should handle the input. Adding checks helps, but does not mitigate the need for a nice set of test data to help verify everything runs the way we expect it to behave.