Various browsers and devices have their own specifications and standards for the kinds of favicon-like icons they use to represent web pages. This answer on the graphic design site gives a pretty good overview.
Suppose you've gone to the trouble to provide a good number of these icon files with the appropriate declarations in your HTML - but you don't happen to have every device Apple has produced plus a Windows 8 device plus various versions of Android to hand to test them all.
Is there any straightforward way to test your configuration and see what files (if any) various devices and browsers will have, without having all the necessary devices to hand?
Edit to be clear, I mean the icons that browsers hoover up and use when representing a web page in browser features like "most visited", "favourites" or when creating home screen shortcuts, which are declared in a web page's
<head> but are not displayed anywhere in the web page