Add test helper.

lib/signed_form/test_helper.rb

@@ -0,0 +1,21 @@
+module SignedForm
+  module TestHelper
+    def permit_all_parameters
+      old_controller = @controller
+
+      anonymous_class = Class.new(@controller.class) do
+        before_filter { params.permit! }
+
+        def self.name; superclass.name; end
+      end
+      @controller = anonymous_class.new
+
+      if block_given?
+        yield
+        @controller = old_controller
+      end
+    end
+  end
+end
+
+::ActionController::TestCase::Behavior.send :include, SignedForm::TestHelper