u-boot/test/py/tests/test_sleep.py

# Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0

import pytest
import time

def test_sleep(u_boot_console):
    """Test the sleep command, and validate that it sleeps for approximately
    the correct amount of time."""

    # 3s isn't too long, but is enough to cross a few second boundaries.
    sleep_time = 3
    tstart = time.time()
    u_boot_console.run_command('sleep %d' % sleep_time)
    tend = time.time()
    elapsed = tend - tstart
    assert elapsed >= sleep_time
    if not u_boot_console.config.gdbserver:
        # 0.25s margin is hopefully enough to account for any system overhead.
        assert elapsed < (sleep_time + 0.25)