Set up a logger on tests

test/test_app.rb

@@ -3,6 +3,9 @@ class TestApp < Rails::Application
     config.eager_load = false
     config.secret_key_base = 'abc123'
   end
+
+  # Set up a logger to avoid creating a log directory on every run.
+  config.logger = Logger.new(nil)
 end
 
 TestApp.initialize!