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Most modern hangable mirrors now have open backs to them enabling the click flow or greenbrook connector to be your test point but still enable quick connection.
I'd just leave the cable hanging (not energised of course) out of the wall. Then when you, sorry your electrician comes to test - inspect - connect wall cabinet/mirror, it'll go straight inside the fitting.
However, if its one of those luminaires that comes with a pre-installed flex, which is difficult to remove, I'd go with one of those aforementioned alternatives.