1 # Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
3 # SPDX-License-Identifier: GPL-2.0
8 def test_sleep(u_boot_console):
9 '''Test the sleep command, and validate that it sleeps for approximately
10 the correct amount of time.'''
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()
16 # 3s isn't too long, but is enough to cross a few second boundaries.
19 u_boot_console.run_command('sleep %d' % sleep_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