Remove check for Rails version >= 5

Author: carlosantoniodasilva

test/rails_app/config/environments/test.rb

@@ -9,13 +9,8 @@
   config.eager_load = false
 
   # Configure static asset server for tests with Cache-Control for performance
-  if Rails.version >= "5"
-    config.public_file_server.enabled = true
-    config.public_file_server.headers = {'Cache-Control' => 'public, max-age=3600'}
-  else
-    config.serve_static_files = true
-    config.static_cache_control = "public, max-age=3600"
-  end
+  config.public_file_server.enabled = true
+  config.public_file_server.headers = {'Cache-Control' => 'public, max-age=3600'}
 
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true