Add in-browser (karma) tests for local and CI

[ethanfrey]

Extend the existing test cases to work in the browser using karma (or other tool)

[ethanfrey]

This may be an alternative if we stick with the react-standard jest testing framework, as karma needs mocha/chai or jasmine.

https://itnext.io/testing-your-javascript-in-a-browser-with-jest-puppeteer-express-and-webpack-c998a37ef887

I'd love to hear of other options

[ethanfrey]

It seems must sample react code uses jest, but puppeteer only gives super high level visibility (check html or rendered page). Nothing like running the unit tests in the browser environment. https://github.com/smooth-code/jest-puppeteer

It seems this will not be done either: jestjs/jest#139 and I guess Facebook has a huge QA department to deal with all the browser quirks

[ethanfrey]

Moving this to later, as we cannot get full test suite, enough to sort out bugs, without facuet in the CI.

[ethanfrey]

Moving this to later, as we cannot get full test suite, enough to sort out bugs, without facuet in the CI.

[ethanfrey]

Blocked on iov-core faucet v0.8.0 integration

[ethanfrey]

Will use jest, no more karma possible