Try disabling logger

Author: eileencodes

config/environments/test.rb

@@ -12,6 +12,7 @@
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
+  config.logger = Logger.new(nil)
   # Configure static file server for tests with Cache-Control for performance.
   config.serve_static_files   = true
   config.static_cache_control = 'public, max-age=3600'