1# Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. 2# 3# SPDX-License-Identifier: GPL-2.0 4 5import pytest 6import time 7 8def test_sleep(u_boot_console): 9 '''Test the sleep command, and validate that it sleeps for approximately 10 the correct amount of time.''' 11 12 # Do this before we time anything, to make sure U-Boot is already running. 13 # Otherwise, the system boot time is included in the time measurement. 14 u_boot_console.ensure_spawned() 15 16 # 3s isn't too long, but is enough to cross a few second boundaries. 17 sleep_time = 3 18 tstart = time.time() 19 u_boot_console.run_command('sleep %d' % sleep_time) 20 tend = time.time() 21 elapsed = tend - tstart 22 delta_to_expected = abs(elapsed - sleep_time) 23 # 0.25s margin is hopefully enough to account for any system overhead. 24 assert delta_to_expected < 0.25 25