diff core/tests/Drupal/Tests/Component/Utility/TimerTest.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/tests/Drupal/Tests/Component/Utility/TimerTest.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,68 @@
+<?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.');
+  }
+
+}