diff --git a/lib/mongo/util/pool_manager.rb b/lib/mongo/util/pool_manager.rb
index 194d863..a7ce367 100644
--- a/lib/mongo/util/pool_manager.rb
+++ b/lib/mongo/util/pool_manager.rb
@@ -3,7 +3,7 @@ module Mongo
 
     attr_reader :connection, :seeds, :arbiters, :primary, :secondaries,
       :primary_pool, :read_pool, :secondary_pools, :hosts, :nodes, :max_bson_size,
-      :tags_to_pools
+      :tags_to_pools, :members
 
     def initialize(connection, seeds)
       @connection = connection
diff --git a/test/unit/pool_manager_test.rb b/test/unit/pool_manager_test.rb
new file mode 100644
index 0000000..fd08ac7
--- /dev/null
+++ b/test/unit/pool_manager_test.rb
@@ -0,0 +1,49 @@
+require './test/test_helper'
+include Mongo
+
+class PoolManagerTest < Test::Unit::TestCase
+
+  context "Initialization: " do
+
+    def setup
+      TCPSocket.stubs(:new).returns(new_mock_socket)
+      @db = new_mock_db
+
+      @connection = stub("Connection")
+      @connection.stubs(:connect_timeout).returns(5000)
+      @connection.stubs(:pool_size).returns(2)
+      @connection.stubs(:socket_class).returns(TCPSocket)
+      @connection.stubs(:[]).returns(@db)
+    end
+
+    should "populate pools correctly" do
+      @connection.stubs(:replica_set_name).returns(nil)
+      @connection.stubs(:log)
+      @arbiters = ['localhost:27020']
+      @hosts = ['localhost:27017', 'localhost:27018', 'localhost:27019',
+        'localhost:27020']
+
+      @db.stubs(:command).returns(
+        # First call to get a socket.
+        {'ismaster' => true, 'hosts' => @hosts, 'arbiters' => @arbiters},
+
+        # Subsequent calls to configure pools.
+        {'ismaster' => true, 'hosts' => @hosts, 'arbiters' => @arbiters},
+        {'secondary' => true, 'hosts' => @hosts, 'arbiters' => @arbiters},
+        {'secondary' => true, 'hosts' => @hosts, 'arbiters' => @arbiters},
+        {'arbiterOnly' => true, 'hosts' => @hosts, 'arbiters' => @arbiters})
+
+      seeds = [['localhost', 27017]]
+      manager = Mongo::PoolManager.new(@connection, seeds)
+      manager.connect
+
+      assert_equal ['localhost', 27017], manager.primary
+      assert_equal 27017, manager.primary_pool.port
+      assert_equal 2, manager.secondaries.length
+      assert_equal 27018, manager.secondary_pools[0].port
+      assert_equal [['localhost', 27020]], manager.arbiters
+    end
+
+  end
+
+end