This question is not about, whether spurious wakeups actually happen, because this was already discussed in full length here: Do spurious wakeups in Java actually happen? Theref
You can't force a spurious wakeup, but to the running thread, a spurious wakeup is indistinguishable from a regular wakeup (the source of the event is different, but the event itself is the same)
To simulate a spurious wakeup, simply call notify();
Calling interrupt()
isn't suitable, because doing so sets the interrupt flag, and after a spurious wakeup, the interrupt flag is not set