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- <?php
- namespace Drupal\Tests\Component\Utility;
- use Drupal\Component\Utility\Timer;
- use PHPUnit\Framework\TestCase;
- /**
- * Tests the Timer system.
- *
- * @group Utility
- *
- * @coversDefaultClass \Drupal\Component\Utility\Timer
- */
- class TimerTest extends TestCase {
- /**
- * Tests Timer::read() time accumulation accuracy across multiple restarts.
- *
- * @covers ::start
- * @covers ::stop
- * @covers ::read
- */
- 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/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 failed to measure at least 4 milliseconds of sleeping while running.');
- $this->assertGreaterThanOrEqual($value + 4, $value2, 'Timer failed to measure at least 8 milliseconds of sleeping while running.');
- $this->assertGreaterThanOrEqual($value2 + 4, $value3, 'Timer failed to measure at least 12 milliseconds of sleeping while running.');
- $this->assertGreaterThanOrEqual($value3 + 4, $value4, 'Timer failed to measure at least 16 milliseconds of sleeping while running.');
- // Stop the timer.
- $value5 = Timer::stop('test');
- $this->assertGreaterThanOrEqual($value4, $value5['time'], 'Timer measured after stopping was not greater than last measurement.');
- // Read again.
- $value6 = Timer::read('test');
- $this->assertEquals($value5['time'], $value6, 'Timer measured after stopping was not equal to the stopped time.');
- // Restart.
- Timer::start('test');
- usleep(5000);
- $value7 = Timer::read('test');
- $this->assertGreaterThanOrEqual($value6 + 4, $value7, 'Timer failed to measure at least 16 milliseconds of sleeping while running.');
- // Stop again.
- $value8 = Timer::stop('test');
- $value9 = Timer::read('test');
- $this->assertEquals($value8['time'], $value9, 'Timer measured after stopping not equal to stop time.');
- }
- }
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