ruby--ruby/test/ruby/test_sleep.rb

require 'test/unit'
require 'etc'

class TestSleep < Test::Unit::TestCase
  def test_sleep_5sec
    GC.disable
    start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    sleep 5
    slept = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
    bottom = 5.0
    assert_operator(slept, :>=, bottom)
    assert_operator(slept, :<=, 6.0, "[ruby-core:18015]: longer than expected")
  ensure
    GC.enable
  end
end