1 files changed, 7 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/testing/performance/ruby/yarv.rb b/activesupport/lib/active_support/testing/performance/ruby/yarv.rb
index d226e75d0d..ed2b8d6803 100644
--- a/activesupport/lib/active_support/testing/performance/ruby/yarv.rb
+++ b/activesupport/lib/active_support/testing/performance/ruby/yarv.rb
@@ -1,3 +1,10 @@
+begin
+  require 'test-unit'
+rescue LoadError
+  $stderr.puts 'Specify test-unit as application\'s dependency in Gemfile to run benchmarks.'
+  exit
+end
+
 module ActiveSupport
   module Testing
     module Performance
@@ -57,6 +64,3 @@ module ActiveSupport
     end
   end
 end
-        
-            
-