Test Smell: it is not a good test practice to write return statement in test cases

Hi!

I notice you write a return statement in some test cases. 
<img width="685" alt="image" src="https://user-images.githubusercontent.com/110402847/185379464-e6a9f7e9-61b3-4fe8-8794-a5059fffb441.png">
Although you return nothing, I would like to know why you write this statement since as far as I know, it is not a good practice to write a return statement in test cases.Thanks.