Level Testing with streaming

I have many levels in my map. I like to test various sections. Problem is I don’t want to have to change the order of map loading just for testing a new section. Is there a way to freeze the player while the level loads so that they don’t fall through the area that hasn’t been loaded yet? In the end I’m going to transition from one area to the next so this won’t be a problem in the final game, but its a problem for testing.