add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22665 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/socket/test_socket.rb

@@ -209,7 +209,40 @@ class TestSocket < Test::Unit::TestCase
     ensure
       servers.each {|s| s.close if !s.closed?  }
     end
+  end
 
+  def test_accept_loop_multi_port
+    servers = []
+    begin
+      servers = Socket.tcp_server_sockets(0)
+      port = servers[0].local_address.ip_port
+      servers2 = Socket.tcp_server_sockets(0)
+      servers.concat servers2
+      port2 = servers2[0].local_address.ip_port
+
+      Socket.tcp("localhost", port) {|s1|
+        Socket.accept_loop(servers) {|s2, client_ai|
+          begin
+            assert_equal(s1.local_address.ip_unpack, client_ai.ip_unpack)
+          ensure
+            s2.close
+          end
+          break
+        }
+      }
+      Socket.tcp("localhost", port2) {|s1|
+        Socket.accept_loop(servers) {|s2, client_ai|
+          begin
+            assert_equal(s1.local_address.ip_unpack, client_ai.ip_unpack)
+          ensure
+            s2.close
+          end
+          break
+        }
+      }
+    ensure
+      servers.each {|s| s.close if !s.closed?  }
+    end
   end
 
   def test_udp_server