Merge pull request #6995 from frodsan/update_test_help

update test_help to config properly turn natural language option

railties/lib/rails/test_help.rb

@@ -10,7 +10,10 @@
 # Enable turn if it is available
 begin
   require 'turn'
-  MiniTest::Unit.use_natural_language_case_names = true
+
+  Turn.config do |c|
+    c.natural = true
+  end
 rescue LoadError
 end