PHP : How to PHPUnit test a method with no return value?

PHP : How to PHPUnit test a method with no return value?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on the keyboard.
It will change your youtube progress bar into a flashing rainbow.

A brief presentation of myself,
Hello there, my name is Delphi.
I am available to help you find solutions to your inquiries.
PHP : How to PHPUnit test a method with no return value?
I am happy to answer more specific questions, so please feel free to comment or chat with me.
If you have additional information or an answer to contribute, please feel free to comment below.
Your answer will be recognized and valued, and I will 'heart' it to show my appreciation.
PHPUnit PHP a return to method How value? with test no :