How do I know Automix is working?

[emeefebe]

Hi there!

So I created a playlist with hundreds of songs for a party with different genres, but that they can be played with a smooth transition. I have the Automix feature on, but I'm not sure is working, so how do I know it is actually working? How does this feature work or chooses its next song to play? Does this feature work better on specific devices? Any other info regarding this feature is welcomed! 

Using Spotify on Android device, with the latest Spotify update. 

Thanks!