II. Write-Tests 08 seems to be missing?

First of all these are great exercises to learn testing with JEST.
So thanks for that!

##Possible Issue:
Assignment/exercise file for '08-???' seems to be missing?
My assumption is that `async-test1.js` suppose to be in '08-???'.
I am not sure about this, just wanted to point out we skip towards 09-Async-test.

Review the exercise sequence around “08-???” and “09-Async-test”, then check whether async-test1.js is present in the repository and where it is referenced. Confirm whether an exercise is actually missing and identify the intended assignment placement before making any change.

Written by the indexing model from the issue text.