Add support for Extended MKCOL (RFC5689)

spec/support/request_helpers.rb

@@ -0,0 +1,11 @@
+module ActionDispatch
+  module Integration
+    module RequestHelpers
+      %w[copy move mkcol options propfind proppatch lock unlock].each do |method|
+        define_method method do |path, **args|
+          process method.to_sym, path, **args
+        end
+      end
+    end
+  end
+end