Since testing lenses is dependant on multiple components in the system,
we will implement a `unity-tool` to help which will be able to talk
to the lenses and examine their results.

Here are some of the use-cases it will be used for:

1) Start a domain-specific search which should return non-zero number
   of results.

2) Start a search with non-sensical string and check that it returns 0 results
   and that the "no-results-hint" is set in the method reply.

More to come...

