fix tests

[veekas]

I was working through your Egghead.io Hooks course locally and couldn't figure out why a test was failing. Turns out it was because the tests weren't up-to-date on my cloned repo because my base branch was master, and I wasn't merging in your branch-by-branch refactors along the way.

This PR just cherry-picks your own test fix from egghead-2018/refactor-02 and merges it back to master to prevent further confusion.

Thanks for all your work!