Invariant error if you simulate an event and programmatically create markup during testing

[andresn]

This happened after completing and trying to work off of the testing section from the Advanced React and Redux course on Udemy:
https://screencast.com/t/4qVkXvXngIuN

[andresn]

I gave up after hours of going in under the hood. I just moved to using Jest/Enzyme and here's the PR: #217