Write some meaningful tests for UserCardComponent

[NicMcPhee]

We currently just confirm that the component builds. It would be nice to check something, but given that there's no logic, I'm not sure what that would look like. Can we test that the @Input works?

[NicMcPhee]

It does look like we can test through the @Input fields. "Testing Angular Components With @Input()" has examples of how we might do that with a host component created just for the purposes of testing.

The Angular documentation also provides examples of using a test host.