title: How to check what screen the application is currently running?
body: <p>Is there a way to check directly what screen an XCUIApplication is currently running / is visible on screen?</p>
  
  <p>I want to be able to XCTAssert that the application is currently displaying screen 'X'. I was thinking I might just create a hidden UIElement or button specific to each screen and then assert that that element exists on the screen. Does anyone have a more elegant or direct way of doing this, though?</p>