Added a test for Thread safety

test/thread_safe_test.rb

@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/test_helper.rb'
+
+class TestController < ActionController::Base
+  
+  def current_user
+    @current_user ||= ActiveSupport::SecureRandom.hex(32)
+  end
+
+end
+
+class ThreadSafeTest < Test::Unit::TestCase
+  
+  should "is thread safe when dealing with audit logging" do
+    blocked = true
+    
+    blocked_thread = Thread.new do 
+      controller = TestController.new
+      controller.send(:set_whodunnit)
+      begin
+        puts "sleep for .001 sec"
+        sleep(0.001)
+      end while blocked
+      PaperTrail.whodunnit
+    end
+
+    fast_running_thread = Thread.new do 
+      controller = TestController.new
+      controller.send(:set_whodunnit)
+      blocked = false
+      PaperTrail.whodunnit
+    end
+    assert_not_equal blocked_thread.value, fast_running_thread.value
+  end
+end