The case: Ben Noah in the process of giyur. Stood before the Beis Din and was asked question 'Will you follow the mitzvot as fully as a goy can up until the end of the process of giyur and completely after the process is done?'.
Do bate din (Jewish courts) in fact demand that a potential ger do mitzvos to the extent possible before giyur? If so, I assume it's so the ger knows what he's getting into and/or so he gets practice, but is that demand codified in halacha or only a practical measure taken by bate din?