1 files changed, 29 insertions, 0 deletions
diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index 82b3c36ed2..f0ec5c751c 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -26,6 +26,35 @@ module ActiveRecord
                "threads should have been removed")
         assert_equal pool.checkins.length, threads.length
       end
+
+      def test_checkout_behaviour
+        pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec
+        connection = pool.connection
+        assert_not_nil connection
+        threads = []
+        4.times do |i|
+          threads << Thread.new(i) do |pool_count|
+            connection = pool.connection
+            assert_not_nil connection
+          end
+        end
+        
+        threads.each {|t| t.join}
+        
+        Thread.new do
+          threads.each do |t|
+            thread_ids = pool.instance_variable_get(:@reserved_connections).keys
+            assert thread_ids.include?(t.object_id)
+          end
+
+          pool.connection
+          threads.each do |t|
+            thread_ids = pool.instance_variable_get(:@reserved_connections).keys
+            assert !thread_ids.include?(t.object_id)
+          end
+        end.join()
+
+      end
     end
   end
 end