From f409ec3ecb04593c400ac3217be9ef44ed25cdd6 Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Sun, 28 Dec 2008 14:24:24 -0500
Subject: [PATCH] Better error message if Webrat mode is unknown

---
 lib/webrat/core/session.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/webrat/core/session.rb b/lib/webrat/core/session.rb
index fe4f44c..f60ede1 100644
--- a/lib/webrat/core/session.rb
+++ b/lib/webrat/core/session.rb
@@ -24,7 +24,17 @@ module Webrat
     when :mechanize
       MechanizeSession
     else
-      raise WebratError.new("Unknown Webrat mode: #{Webrat.configuration.mode.inspect}")
+      raise WebratError.new(<<-STR)
+Unknown Webrat mode: #{Webrat.configuration.mode.inspect}
+
+Please ensure you have a Webrat configuration block that specifies a mode
+in your test_helper.rb, spec_helper.rb, or env.rb (for Cucumber).
+For example:
+
+  Webrat.configure do |config|
+    config.mode = :rails
+  end
+      STR
     end
   end