Add limited automated frontend testing

[henrietteharmse]

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Limited frontend testing can be used to ensure correct information is displayed. Consider something like Selenium or similar.

Historically I have seen little value in automated frontend testing (because integration tests ensure correctness of returned data), but it may worth considering in this case. Should only added if it does add value.

[jamesamcl]

I'm concerned about doing this while the frontend is under heavy development. I think we should focus on the dataload and API testing until we're 100% happy with those, which hopefully should sync with @serjoshua finalizing the frontend.

[henrietteharmse]

This can happen in parallel. Frontend should have ids for elements with populated data which can be tested against.