gistfile1

diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index af6f1bc..016d7b3 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -1,6 +1,8 @@
 begin
   require File.expand_path('../../../vendor/gems/environment', __FILE__)
 rescue LoadError
+  $stderr.puts "Running Rails tests requires Bundler. Please 'gem install bundler' and run 'gem bundle' from the Rails checkout path."
+  exit!
 end
 
 lib = File.expand_path('../../lib', __FILE__)
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 8c65087..c2b1eda 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -1,6 +1,8 @@
 begin
   require File.expand_path('../../../vendor/gems/environment', __FILE__)
 rescue LoadError
+  $stderr.puts "Running Rails tests requires Bundler. Please 'gem install bundler' and run 'gem bundle' from the Rails checkout path."
+  exit!
 end
 
 lib = File.expand_path('../../lib', __FILE__)
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 3019395..407459c 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,6 +1,8 @@
 begin
   require File.expand_path('../../../../vendor/gems/environment', __FILE__)
 rescue LoadError
+  $stderr.puts "Running Rails tests requires Bundler. Please 'gem install bundler' and run 'gem bundle' from the Rails checkout path."
+  exit!
 end
 
 lib = File.expand_path('../../../lib', __FILE__)
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 479970b..919da7b 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -1,6 +1,8 @@
 begin
   require File.expand_path('../../../../vendor/gems/environment', __FILE__)
 rescue LoadError
+  $stderr.puts "Running Rails tests requires Bundler. Please 'gem install bundler' and run 'gem bundle' from the Rails checkout path."
+  exit!
 end
 
 lib = File.expand_path('../../../lib', __FILE__)
diff --git a/activeresource/test/abstract_unit.rb b/activeresource/test/abstract_unit.rb
index 5fa6d30..d709614 100644
--- a/activeresource/test/abstract_unit.rb
+++ b/activeresource/test/abstract_unit.rb
@@ -1,6 +1,8 @@
 begin
   require File.expand_path('../../../vendor/gems/environment', __FILE__)
 rescue LoadError
+  $stderr.puts "Running Rails tests requires Bundler. Please 'gem install bundler' and run 'gem bundle' from the Rails checkout path."
+  exit!
 end
 
 lib = File.expand_path('../../lib', __FILE__)