user32/edit and comctl32/edit basically look the same to me (so could those test parts be commonized?)
They look the same but they are for different components, one for user32 edit and the another for the edit control of comctl32 version 6.
WM_ASKCBFORMATNAME basically has no meaningful tests though (so that would be a nice thing to work on) but probably nothing relies on that message either (so 🤷)
It's better to have a test.