public function TimerUnitTest::testTimer

Tests Timer::read() time accumulation accuracy across multiple restarts.

See also

Drupal\Component\Utility\Timer::read()

File

drupal/core/tests/Drupal/Tests/Component/Utility/TimerUnitTest.php, line 33

Contains \Drupal\Tests\Component\Utility\TimerUnitTest.

Class

TimerUnitTest

Tests the Timer system.

Namespace

Code

public function testTimer() {
  Timer::start('test');
  usleep(5000);
  $value = Timer::read('test');
  usleep(5000);
  $value2 = Timer::read('test');
  usleep(5000);
  $value3 = Timer::read('test');
  usleep(5000);
  $value4 = Timer::read('test');

  // Although we sleep for 5 milliseconds, we should test that at least 4 ms
  // have past because usleep() is not reliable on Windows. See
  // http://php.net/manual/en/function.usleep.php for more information. The
  // purpose of the test to validate that the Timer class can measure elapsed
  // time not the granularity of usleep() on a particular OS.
  $this
    ->assertGreaterThanOrEqual(4, $value, 'Timer measured at least 4 milliseconds of sleeping while running.');
  $this
    ->assertGreaterThanOrEqual($value + 4, $value2, 'Timer measured at least 8 milliseconds of sleeping while running.');
  $this
    ->assertGreaterThanOrEqual($value2 + 4, $value3, 'Timer measured at least 12 milliseconds of sleeping while running.');
  $this
    ->assertGreaterThanOrEqual($value3 + 4, $value4, 'Timer measured at least 16 milliseconds of sleeping while running.');
}