Raise Net::LDAP::ConnectionRefusedError when new connection is refused.

lib/net/ldap/connection.rb

@@ -14,7 +14,7 @@ def initialize(server)
     rescue SocketError
       raise Net::LDAP::Error, "No such address or other socket error."
     rescue Errno::ECONNREFUSED
-      raise Net::LDAP::Error, "Server #{server[:host]} refused connection on port #{server[:port]}."
+      raise Net::LDAP::ConnectionRefusedError, "Server #{server[:host]} refused connection on port #{server[:port]}."
     rescue Errno::EHOSTUNREACH => error
       raise Net::LDAP::Error, "Host #{server[:host]} was unreachable (#{error.message})"
     rescue Errno::ETIMEDOUT

lib/net/ldap/error.rb

@@ -9,7 +9,22 @@ class Error < StandardError; end
 
   class AlreadyOpenedError < Error; end
   class SocketError < Error; end
-  class ConnectionRefusedError < Error; end
+  class ConnectionRefusedError < Error;
+    def initialize(*args)
+      warn_deprecation_message
+      super
+    end
+
+    def message
+      warn_deprecation_message
+      super
+    end
+
+    private
+    def warn_deprecation_message
+      warn "Deprecation warning: Net::LDAP::ConnectionRefused will be deprecated. Use Errno::ECONNREFUSED instead."
+    end
+  end
   class NoOpenSSLError < Error; end
   class NoStartTLSResultError < Error; end
   class NoSearchBaseError < Error; end

test/test_ldap_connection.rb

@@ -1,6 +1,14 @@
 require_relative 'test_helper'
 
 class TestLDAPConnection < Test::Unit::TestCase
+  def capture_stderr
+    stderr, $stderr = $stderr, StringIO.new
+    yield
+    $stderr.string
+  ensure
+    $stderr = stderr
+  end
+
   def test_unresponsive_host
     assert_raise Net::LDAP::Error do
       Net::LDAP::Connection.new(:host => 'test.mocked.com', :port => 636)
@@ -14,6 +22,16 @@ def test_blocked_port
     end
   end
 
+  def test_connection_refused
+    flexmock(TCPSocket).should_receive(:new).and_raise(Errno::ECONNREFUSED)
+    stderr = capture_stderr do
+      assert_raise Net::LDAP::ConnectionRefusedError do
+        Net::LDAP::Connection.new(:host => 'test.mocked.com', :port => 636)
+      end
+    end
+    assert_equal("Deprecation warning: Net::LDAP::ConnectionRefused will be deprecated. Use Errno::ECONNREFUSED instead.\n",  stderr)
+  end
+
   def test_raises_unknown_exceptions
     error = Class.new(StandardError)
     flexmock(TCPSocket).should_receive(:new).and_raise(error)