fixup: fix test

Author: rudiejd

apps/state_mediator/config/test.exs

@@ -6,6 +6,12 @@ config :state_mediator, State.FakeModuleB, source: {:system, "FAKE_VAR_B", "defa
 
 config :state_mediator, State.FakeModuleC, source: "default_c"
 
+config :state_mediator, :commuter_rail_crowding,
+  enabled: "true",
+  s3_bucket: "mbta-gtfs-commuter-rail-prod",
+  s3_object: "crowding-trends.json",
+  source: "s3"
+
 # Record the original working directory so that when it changes during the
 # test run, we can still find the MBTA_GTFS_FILE.
 config :state_mediator, :cwd, File.cwd!()