I don't know how we could test it but, little pointers the believers quote are -
De Ja Vue - your sure you've done this before, been there before, know something about a place that you have never been to prior.
People that have suffered trauma and in a coma - waking up and speaking fluently in another language.
Swearing something you have seen is different to what many others swear to - the one quoted is the James Bond film - Moonraker - Jaws and his girlfriend - the end scene in space where Jaws looks at his girlfriend, she looks at him, they are both doomed and they smile at each other - roughly half the people remember her smiling and having braces on her teeth - the other half say she doesn't - this is said to have been a glitch in the sim. (I wont spoil it for you, whatever you remember go check it out and see if what you remember is right)
There is another one regarding i think it was photons being fired at a screen through a slotted hole - like a post box that behave differently when monitored. It was something like the photons travel in a straight line when fired and therefore the target screen behind the slot should produce a straight line of contact points but it doesn't, it produces a scattered pattern, theory says the photons may collide and change trajectory to explain that, but, when monitored as an individual photon it only travels in a straight line, then with multiple split second additional monitors multiple photons collisions don't change trajectory so it produces the straight line - (something like that) Have a look at the WF files on YouTube.
I'm still looking for the reboot switch - I want to be super rich and live an exotic lifestyle in the next update. (and 40 years younger)