support all ruby versions

Author: hggh

test/helper.rb

@@ -5,6 +5,8 @@
 require "logger"
 require "stringio"
 
+(class Random; def self.rand(*args) super end; end) unless defined?(Random)
+
 begin
   require "ruby-debug"
 rescue LoadError

test/internals_test.rb

@@ -361,7 +361,7 @@ def af_family_supported(af)
         begin
           tries = 5
           begin
-            sa = Socket.pack_sockaddr_in(Random.rand(1024..65000), hosts[af])
+            sa = Socket.pack_sockaddr_in(1024 + Random.rand(63076), hosts[af])
             s.bind(sa)
           rescue Errno::EADDRINUSE => e
             tries -= 1