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This gets the / route working to return basic server information
I had the same thought when I put that in, but I don't have a better solution yet.

I tried getting the App's config object in the test and setting db_connect_string, but the change wasn't seen when execution got here.

I wanted the tests to use a File::Temp file so they'd get automatically cleaned up after each test.  A developer would run it in 'developer' mode, and it would use a persistent DB somewhere on disk (probably in /tmp) that they could manipulate.  'production' mode would use a real Postgres DB.