Migrate JavaScript test framework to more popular alternative

[gnikonorov]

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We currently use QUnit for unit testing our JavaScript.

I propose that we move to a more modern testing framework ( the top five listed here seem to pop up a bit ).

I would like to add that any library we migrate to should have good support for testing URL parameters. QUnit forces the definition of one test script per URL which I think isn't ideal, since it's pretty cumbersome: https://stackoverflow.com/questions/27388596/pass-url-parameter-to-qunit-test-using-grunt

As a follow up, tests should be written for all URL parameters, since we currently have 0 tests for them.

@BeyondEvil maybe this is something we could tackle as part of the next gen migration?

[BeyondEvil]

@BeyondEvil maybe this is something we could tackle as part of the next gen migration?

Yes!