minor: test fix

Author: banker

test/slave_connection_test.rb

@@ -8,8 +8,8 @@ def self.connect_to_slave
     @@host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
     @@port = ENV['MONGO_RUBY_DRIVER_PORT'] || Connection::DEFAULT_PORT
     conn = Connection.new(@@host, @@port, :slave_ok => true)
-    cmd = conn['admin'].command(:ismaster => 1)
-    cmd['ok'] == 1 && cmd['ismaster'] != 1
+    response = conn['admin'].command(:ismaster => 1)
+    Mongo::Support.ok?(response['ok']) && response['ismaster'] != 1
   end
 
   if self.connect_to_slave