Well - my experience _may_ be somewhat atypical. I'm working on my PhD in Computational Nuclear Engineering at MIT. At MIT the tests are all so damn hard you could have a whole week and work on it with your friends and it _still_ wouldn't matter. That's why they don't care if you use your book/notes/internet/iPad Pro lol.
I'm TA'ing for a class this semester where the professor makes each test so that an expert in the field who has been working on that material for the last 40 years still wouldn't be able to get above a B. The average on the last test was a 45% (that class has open book/notes/laptop AND internet AND dog AND whatever else you think might help you because you have no hope
But I'm sure that many schools are opening up to using laptops during tests because it's one of the main ways students take notes and work on homework these days... you just have to get a bit more "creative" with the tests ;-)
EDIT: BTW... there are classes here that literally have take home tests where you can work with friends... it doesn't help ;-)