Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Tests\Component\Utility;
Chris@0: 
Chris@0: use Drupal\Component\Utility\Timer;
Chris@0: use PHPUnit\Framework\TestCase;
Chris@0: 
Chris@0: /**
Chris@0:  * Tests the Timer system.
Chris@0:  *
Chris@0:  * @group Utility
Chris@0:  *
Chris@0:  * @coversDefaultClass \Drupal\Component\Utility\Timer
Chris@0:  */
Chris@0: class TimerTest extends TestCase {
Chris@0: 
Chris@0:   /**
Chris@0:    * Tests Timer::read() time accumulation accuracy across multiple restarts.
Chris@0:    *
Chris@0:    * @covers ::start
Chris@0:    * @covers ::stop
Chris@0:    * @covers ::read
Chris@0:    */
Chris@0:   public function testTimer() {
Chris@0:     Timer::start('test');
Chris@0:     usleep(5000);
Chris@0:     $value = Timer::read('test');
Chris@0:     usleep(5000);
Chris@0:     $value2 = Timer::read('test');
Chris@0:     usleep(5000);
Chris@0:     $value3 = Timer::read('test');
Chris@0:     usleep(5000);
Chris@0:     $value4 = Timer::read('test');
Chris@0: 
Chris@0:     // Although we sleep for 5 milliseconds, we should test that at least 4 ms
Chris@0:     // have past because usleep() is not reliable on Windows. See
Chris@0:     // http://php.net/manual/function.usleep.php for more information. The
Chris@0:     // purpose of the test to validate that the Timer class can measure elapsed
Chris@0:     // time not the granularity of usleep() on a particular OS.
Chris@0:     $this->assertGreaterThanOrEqual(4, $value, 'Timer failed to measure at least 4 milliseconds of sleeping while running.');
Chris@0: 
Chris@0:     $this->assertGreaterThanOrEqual($value + 4, $value2, 'Timer failed to measure at least 8 milliseconds of sleeping while running.');
Chris@0: 
Chris@0:     $this->assertGreaterThanOrEqual($value2 + 4, $value3, 'Timer failed to measure at least 12 milliseconds of sleeping while running.');
Chris@0: 
Chris@0:     $this->assertGreaterThanOrEqual($value3 + 4, $value4, 'Timer failed to measure at least 16 milliseconds of sleeping while running.');
Chris@0: 
Chris@0:     // Stop the timer.
Chris@0:     $value5 = Timer::stop('test');
Chris@0:     $this->assertGreaterThanOrEqual($value4, $value5['time'], 'Timer measured after stopping was not greater than last measurement.');
Chris@0: 
Chris@0:     // Read again.
Chris@0:     $value6 = Timer::read('test');
Chris@0:     $this->assertEquals($value5['time'], $value6, 'Timer measured after stopping was not equal to the stopped time.');
Chris@0: 
Chris@0:     // Restart.
Chris@0:     Timer::start('test');
Chris@0:     usleep(5000);
Chris@0:     $value7 = Timer::read('test');
Chris@0:     $this->assertGreaterThanOrEqual($value6 + 4, $value7, 'Timer failed to measure at least 16 milliseconds of sleeping while running.');
Chris@0: 
Chris@0:     // Stop again.
Chris@0:     $value8 = Timer::stop('test');
Chris@0:     $value9 = Timer::read('test');
Chris@0:     $this->assertEquals($value8['time'], $value9, 'Timer measured after stopping not equal to stop time.');
Chris@0:   }
Chris@0: 
Chris@0: }