From 1f870a2c5911b2eec519062486a74a725e924b3d Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Sat, 28 Jul 2012 20:40:27 -0700
Subject: [PATCH] issue a warning when we cannot construct a controller

---
 actionpack/lib/action_controller/test_case.rb | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/actionpack/lib/action_controller/test_case.rb b/actionpack/lib/action_controller/test_case.rb
index eb7194ebaf..4ccb77992e 100644
--- a/actionpack/lib/action_controller/test_case.rb
+++ b/actionpack/lib/action_controller/test_case.rb
@@ -529,11 +529,19 @@ module ActionController
         @response         = TestResponse.new
         @response.request = @request
 
+        @controller = nil unless defined? @controller
+
         if klass = self.class.controller_class
-          @controller ||= klass.new rescue nil
+          unless @controller
+            begin
+              @controller = klass.new
+            rescue
+              warn "could not construct controller #{klass}" if $VERBOSE
+            end
+          end
         end
 
-        if defined?(@controller) && @controller
+        if @controller
           @controller.request = @request
           @controller.params = {}
         end