tests don't need the default session features turned on

src/session_impl.cpp

@@ -188,6 +188,7 @@ namespace aux {
 		, m_total_failed_bytes(0)
 		, m_total_redundant_bytes(0)
 	{
+		TORRENT_ASSERT(listen_interface);
 		error_code ec;
 		m_listen_interface = tcp::endpoint(address::from_string(listen_interface, ec), listen_port_range.first);
 		TORRENT_ASSERT(!ec);