Feature/front end tests

[KhalidAdan]

This is the first pass at getting better front-end code coverage, it's getting a little large so I think I'll get this half reviewed and then setup the next set of tests in a separate PR.

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eligibility-estimator – ./

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[KhalidAdan]

There seems to be an issue where toString().replaceAll(x,y) doesn't exist in the test environment but works fine locally -- trying to fix this now!

Edit: Our version of node on this project does not have replaceAll(), gonna try and use a shim in test

Edit x2: That did it!

[JeremyKennedy]

Seems fine to me!