Merge pull request #12277 from djberg96/asset_caching

Use memory store for assets in test environment

config/environments/test.rb

@@ -18,6 +18,11 @@
   config.public_file_server.enabled = true
   config.static_cache_control = "public, max-age=3600"
 
+  # Avoid potential warnings and race conditions
+  config.assets.configure do |env|
+    env.cache = ActiveSupport::Cache.lookup_store(:memory_store)
+  end
+
   # Log error messages when you accidentally call methods on nil
   config.whiny_nils = true