RUBY-190 bug fix for unavailable nodes on Connection#multi

lib/mongo/connection.rb

@@ -600,7 +600,7 @@ module Mongo
         config = self['admin'].command({:ismaster => 1}, :sock => socket)
 
       rescue OperationFailure, SocketError, SystemCallError, IOError => ex
-        close
+        close unless connected?
       ensure
         @nodes_tried << node
         if config

test/replica_sets/connect_test.rb

@@ -0,0 +1,38 @@
+$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+require 'mongo'
+require 'test/unit'
+require './test/test_helper'
+
+# NOTE: This test expects a replica set of three nodes to be running on local host.
+class ConnectTest < Test::Unit::TestCase
+  include Mongo
+
+  def test_connect
+    @conn = Mongo::Connection.multi([['localhost', 27017], ['localhost', 27018], ['localhost', 27019]])
+    assert @conn.connected?
+  end
+
+  def test_connect_with_first_node_down
+    puts "Please kill the node at 27017."
+    gets
+
+    @conn = Mongo::Connection.multi([['localhost', 27017], ['localhost', 27018], ['localhost', 27019]])
+    assert @conn.connected?
+  end
+
+  def test_connect_with_second_node_down
+    puts "Please kill the node at 27018."
+    gets
+
+    @conn = Mongo::Connection.multi([['localhost', 27017], ['localhost', 27018], ['localhost', 27019]])
+    assert @conn.connected?
+  end
+
+  def test_connect_with_third_node_down
+    puts "Please kill the node at 27019."
+    gets
+
+    @conn = Mongo::Connection.multi([['localhost', 27017], ['localhost', 27018], ['localhost', 27019]])
+    assert @conn.connected?
+  end
+end