Fix DRb.start_service to use any available port

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58995 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/rubyspec/library/drb/start_service_spec.rb

@@ -3,35 +3,26 @@ require File.expand_path('../fixtures/test_server', __FILE__)
 require 'drb'
 
 describe "DRb.start_service" do
-  before :all do
-    @port = 9001 + (Process.pid & 7 )
+  before :each do
+    @server = DRb.start_service("druby://localhost:0", TestServer.new)
   end
 
-  before :each do
-    @url = "druby://localhost:#{@port}"
-    @port += 1
+  after :each do
+    DRb.stop_service if @server
   end
 
   it "runs a basic remote call" do
-    lambda { DRb.current_server }.should raise_error(DRb::DRbServerNotFound)
-    server = DRb.start_service(@url, TestServer.new)
-    DRb.current_server.should == server
-    obj = DRbObject.new(nil, @url)
+    DRb.current_server.should == @server
+    obj = DRbObject.new(nil, @server.uri)
     obj.add(1,2,3).should == 6
-    DRb.stop_service
-    lambda { DRb.current_server }.should raise_error(DRb::DRbServerNotFound)
   end
 
   it "runs a basic remote call passing a block" do
-    lambda { DRb.current_server }.should raise_error(DRb::DRbServerNotFound)
-    server = DRb.start_service(@url, TestServer.new)
-    DRb.current_server.should == server
-    obj = DRbObject.new(nil, @url)
+    DRb.current_server.should == @server
+    obj = DRbObject.new(nil, @server.uri)
     obj.add_yield(2) do |i|
       i.should == 2
       i+1
     end.should == 4
-    DRb.stop_service
-    lambda { DRb.current_server }.should raise_error(DRb::DRbServerNotFound)
   end
 end