Problem/Motivation
core/tests/README.md is out of date in at least the following places:
### Additional setup for JavaScript tests
* chromedriver (tested with version 2.45) -- see
https://sites.google.com/chromium.org/driver/
Chromedriver 2.45 is obsolete; you must test with a version of Chromedriver that matches your local Chrome.
If you want to transpile with babel (e.g. to use `import`
statements) outside of core, then add your own babel config to the root of your
project.
We no longer use Babel.