Compile dev routes in test

As the route is rendered in the stats page, it needs to be enabled in
all Mix environments in order to avoid compile time warnings.

config/test.exs

@@ -28,4 +28,6 @@ config :phoenix, :plug_init_mode, :runtime
 config :phoenix_live_view,
   enable_expensive_runtime_checks: true
 
+config :music_library, dev_routes: true
+
 config :music_library, LastFm, api: nil