static void test_change_group(session &sess)
{
	server_node &node = global_data->nodes.back();
	const uint32_t backend_id = 4;
	const int old_group_id = 2;
	const int new_group_id = 10;

	std::string host = node.remote().to_string();
	auto old_tuple = std::make_tuple(host, old_group_id, backend_id);
	auto new_tuple = std::make_tuple(host, new_group_id, backend_id);

	auto unique_hosts = get_unique_hosts(sess);

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(old_tuple) != unique_hosts.end(),
		"Host must not exist: " + host + ", group: 2, backend: 1");

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(new_tuple) == unique_hosts.end(),
		"Host must not exist: " + host + ", group: 10, backend: 1");

	server_config server = node.config();
	config_data &backend = server.backends[backend_id];
	backend("group", new_group_id);

	server.write(node.config_path());

	ELLIPTICS_REQUIRE(stop_result, sess.disable_backend(node.remote(), backend_id));
	ELLIPTICS_REQUIRE(start_result, sess.enable_backend(node.remote(), backend_id));

	// Wait 0.1 secs to ensure that route list was changed
	usleep(100 * 1000);

	unique_hosts = get_unique_hosts(sess);

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(old_tuple) == unique_hosts.end(),
		"Host must not exist: " + host + ", group: 2, backend: 1");

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(new_tuple) != unique_hosts.end(),
		"Host must not exist: " + host + ", group: 10, backend: 1");
}
static void test_disable_backend(session &sess)
{
	server_node &node = global_data->nodes[0];

	std::string host = node.remote().to_string();
	auto tuple = std::make_tuple(host, 0, 1);

	auto unique_hosts = get_unique_hosts(sess);

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(tuple) != unique_hosts.end(),
		"Host must exist: " + host + ", group: 0, backend: 1");

	ELLIPTICS_REQUIRE(enable_result, sess.disable_backend(node.remote(), 1));

	// Wait 0.1 secs to ensure that route list was changed
	usleep(100 * 1000);

	unique_hosts = get_unique_hosts(sess);

	BOOST_REQUIRE_MESSAGE(unique_hosts.find(tuple) == unique_hosts.end(),
		"Host must not exist: " + host + ", group: 0, backend: 1");
}
static void test_disable_backend_again(session &sess)
{
	server_node &node = global_data->nodes[0];

	ELLIPTICS_REQUIRE_ERROR(enable_result, sess.disable_backend(node.remote(), 1), -EALREADY);
}