Switch to threaded tasks, see also celluloid/celluloid#251

lib/sidekiq/actor.rb

@@ -12,6 +12,8 @@ module Sidekiq
   module Actor
     if $TESTING
 
+      TaskThread = 0
+
       def sleep(amount=0)
       end
 
@@ -51,6 +53,8 @@ module Sidekiq
           alias_method :new_link, :new
           def trap_exit(meth)
           end
+          def task_class(konstant)
+          end
         end
       end
 

lib/sidekiq/processor.rb

@@ -14,6 +14,8 @@ module Sidekiq
     include Util
     include Actor
 
+    task_class TaskThread
+
     def self.default_middleware
       Middleware::Chain.new do |m|
         m.add Middleware::Server::Logging