Bring config.allow_concurrency back

Since the Rack::Lock still exists in development,
let's provide a way to disable it explicitly.

1 files changed, 6 insertions, 0 deletions

diff --git a/railties/test/application/middleware_test.rb b/railties/test/application/middleware_test.rb
index 73ef2046c0..d8076c7151 100644
--- a/railties/test/application/middleware_test.rb
+++ b/railties/test/application/middleware_test.rb
@@ -96,6 +96,12 @@ module ApplicationTests
       assert !middleware.include?("Rack::Lock")
     end
 
+    test "removes lock if allow concurrency is set" do
+      add_to_config "config.allow_concurrency = true"
+      boot!
+      assert !middleware.include?("Rack::Lock")
+    end
+
     test "removes static asset server if serve_static_assets is disabled" do
       add_to_config "config.serve_static_assets = false"
       boot!