Added method to get port of XMLRPC::Server (#18)

Useful when you start the server with port=0 and let Webrick select the
port.

Author: herwinw

lib/xmlrpc/server.rb

@@ -594,6 +594,11 @@ def shutdown
     @server.shutdown
   end
 
+  # Get the port of the server, useful when started with port=0
+  def port
+    @server.config[:Port]
+  end
+
 end
 
 

test/test_server.rb

@@ -0,0 +1,25 @@
+# coding: utf-8
+# frozen_string_literal: true
+
+require 'test/unit'
+require 'stringio'
+require 'xmlrpc/client'
+require 'xmlrpc/server'
+
+module TestXMLRPC
+class Test_XMLRPC_Server < Test::Unit::TestCase
+  def test_port
+    s = XMLRPC::Server.new(0, '127.0.0.1', 1, StringIO.new)
+    refute_equal(0, s.port, 'Selected random port')
+
+    s.add_handler('test.add') { |a, b| a + b }
+    srv_thread = Thread.new { s.serve }
+    
+    c = XMLRPC::Client.new('127.0.0.1', '/', s.port)
+    assert_equal(7, c.call('test.add', 3, 4))
+
+    s.shutdown
+    srv_thread.kill
+  end
+end
+end