Add e2e tests

[NCGThompson]

To quote the Good Word:

Run ng e2e to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.

According to what I read on the web, the kind of test in #8 would probably best be done with an e2e framework rather than a unit testing framework. Does someone think they are up for this?