Fixed intermittently failing RubyThreadPoolExecutor spec.

Author: jdantonio

spec/concurrent/executor/ruby_thread_pool_executor_spec.rb

@@ -154,28 +154,16 @@ module Concurrent
           Thread.list.length.should < initial + 5
         end
 
-        specify '#post executes the task on the current thread when the queue is at capacity' do
-          subject.should_receive(:handle_overflow).with(any_args).at_least(:once)
-          5.times{ subject.post{ sleep(0.1) } }
-        end
-
-        specify '#post executes the task on the current thread when the queue is at capacity' do
-          bucket = []
-          5.times{|i| subject.post{ bucket.push(i) } }
-          sleep(0.1)
-          bucket.sort.should eq [0, 1, 2, 3, 4]
-        end
-
         specify '#<< executes the task on the current thread when the queue is at capacity' do
           subject.should_receive(:handle_overflow).with(any_args).at_least(:once)
           5.times{ subject << proc { sleep(0.1) } }
         end
 
         specify '#post executes the task on the current thread when the queue is at capacity' do
-          bucket = []
-          5.times{|i| subject << proc { bucket.push(i) } }
-          sleep(0.1)
-          bucket.sort.should eq [0, 1, 2, 3, 4]
+          latch = Concurrent::CountDownLatch.new(5)
+          subject.post{ sleep(1) }
+          5.times{|i| subject.post{ latch.count_down } }
+          latch.wait(0.1)
         end
       end
     end