update mock

Author: Jerry Cheung

test/test_ldap_connection.rb

@@ -202,7 +202,7 @@ def test_queued_read_setup_encryption_with_start_tls
       and_return(result2)
     mock.should_receive(:write)
     conn = Net::LDAP::Connection.new(:socket => mock)
-    flexmock(Net::LDAP::Connection).should_receive(:wrap_with_ssl).with(mock, nil).
+    flexmock(Net::LDAP::Connection).should_receive(:wrap_with_ssl).with(mock, {}).
       and_return(mock)
 
     conn.next_msgid # simulates ongoing query