Run tests in browser environment such as puppeteer

[carsonfarmer]

We use jest for tests, which is great on nodejs environments. But due to differences between native apis between node and browsers, it would be good to test in browser environments as well. See https://jestjs.io/docs/en/puppeteer for possible way to do this.

[carsonfarmer]

We've started to move other projects over to testing with https://www.npmjs.com/package/polendina. Requires moving tests over to mocha (or, a least that's the nicest framework to use).