I wrote an automation test in selenium java that detects if the page is redirecting (the automation detects if a new page is opened, the page redirects to other page, a new tab is opened and if an alert window is opened) 

Now to the problem.
one of the redirects i can't find any way to detect is an automatic downloaded file (you enter a website and the website automatically downloads a file without any trigger from the user)

p.s. 

I know the download process may differ in each browser,
I need it to work mainly on chrome

Thanks