Is there any way to run ember acceptance test case in slow mode?

I have written some ember acceptance test cases. The thing is when I visit the URL http://localhost:4200/tests and filter module by Acceptance, the test cases are running lightning fast. Even though those were written in async await function.

I want to put a time delay for each line using ember run loop run.later or run.next. But that's not the solution.

Is there a way to add slow mode somewhere in the top of the application (or) Is there any test helpers which is already present? So I can see test cases running in action.