test/py/tests/test_sleep.py

   1 # Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: GPL-2.0
   4
   5 import pytest
   6 import time
   7
   8 """
   9 Note: This test doesn't rely on boardenv_* configuration values but they can
  10 change test behavior.
  11
  12 # Setup env__sleep_accurate to False if time is not accurate on your platform
  13 env__sleep_accurate = False
  14
  15 """
  16
  17 def test_sleep(u_boot_console):
  18     """Test the sleep command, and validate that it sleeps for approximately
  19     the correct amount of time."""
  20
  21     sleep_skip = u_boot_console.config.env.get('env__sleep_accurate', True)
  22     if not sleep_skip:
  23         pytest.skip('sleep is not accurate')
  24
  25     if u_boot_console.config.buildconfig.get('config_cmd_misc', 'n') != 'y':
  26         pytest.skip('sleep command not supported')
  27     # 3s isn't too long, but is enough to cross a few second boundaries.
  28     sleep_time = 3
  29     tstart = time.time()
  30     u_boot_console.run_command('sleep %d' % sleep_time)
  31     tend = time.time()
  32     elapsed = tend - tstart
  33     assert elapsed >= (sleep_time - 0.01)
  34     if not u_boot_console.config.gdbserver:
  35         # 0.25s margin is hopefully enough to account for any system overhead.
  36         assert elapsed < (sleep_time + 0.25)