Test boot_partition for ZyXEL WSM20: switch to partition 2 (success).
Writes the boot-number byte "02" at offset 4 of the "persist" partition.

-- File fs/open~_tmp_sysinfo_board_name.txt --
zyxel,wsm20
-- End --

-- File fs/popen~_lib_functions_sh_find_mtd_part_persist_.txt --
/dev/mtdblock7
-- End --

-- File fs/popen~printf_b_x02_dd_of_dev_mtdblock7_bs_1_seek_4_count_1_conv_notrunc_2_dev_null_echo_.txt --
0
-- End --

-- Testcase --
let ar = require('advanced_reboot');
let api = ar["luci.advanced-reboot"];
let result = api.boot_partition.call({ args: { number: "2" } });
printf("%J\n", result);
-- End --

-- Expect stdout --
{ }
-- End --