CPS test stands for Click Per Second test. It can be a 5-second simple test. You need to click as many times as possible before time's up. Feel free to try as many times as you want. Make sure to get your best score.
The CPS value gives you the exact idea of how fast you can click your mouse button. In games like Minecraft etc., the CPS matters a lot. Higher Click speed will help you in tasks like Fighting, Bridging and Putting up walls. CPS Test I have explained all these further on this page.