I wonder why is this not part of the standard safety tests. It can be done before a crash test, for instance.
Exiting through a window is probably not a common case. Or even entering from outside to retrieve a person.
I think likely much better would be to mandate solution that forces doors to fully unlock in case of a crash or large water ingress.
What exactly are you proposing gets tested? The windows are supposed to be hard to break so people don’t fly out of them…