tests break the functionality of the page

[tsacinim]

Issue Description

Running the tests removes the editor content. Afterwards, the functionality is also lost.

To reproduce:

1. select 'markdown previewer' test suite
2. click 'run tests' button
3. insert text in the 'editor' field (the preview is not updated)

Browser Information

• Browser Name, Version: Chromium, 64.0.3282.167
• Operating System: Ubuntu
• Mobile, Desktop, or Tablet: Desktop

Your Code / Link to Your Pen

link to codepen

this is also happening in the official example:

link to official codepen

[tsacinim]

The version of React used is 15.6.1 (this is the version added at the moment by default in codepen, also for this version dispatchEvent is reported as not working in the react issue linked). The official codepen uses React 15.3.1 (for which the dispachEvent is reported as working).