CallbackDurationTest.php

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<?php

declare(strict_types=1);

namespace HTTP\Services;

use PHPUnit\Framework\TestCase;
use ILIAS\HTTP\Duration\CallbackDuration;

class CallbackDurationTest extends TestCase
{
//    // there isn't a good way to test the shutdown-function with PHPUnit (yet?).
//    public function testCallbackStretchingWithExit() : void
//    {
//        $callback = $this->getTestCallbackWithLength(1, true);
//        $duration = new CallbackDuration(1);
//
//        $this->expectException(\LogicException::class);
//        $this->expectExceptionMessage("Callback could not be stretched because it halted the programm.");
//        $duration->stretch($callback);
//    }

    public function testCallbackStretchingWithTooLongExecutionTime(): void
    {
        $callback = $this->getTestCallbackWithLength(2);
        $duration = new CallbackDuration(1);

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessage("Execution of callback exceeded the given duration and could not be stretched.");
        $duration->stretch($callback);
    }

    public function testCallbackStretching(): void
    {
        $callback = $this->getTestCallbackWithLength(1);
        $duration = new CallbackDuration(3);

        $start_time = microtime(true);
        $duration->stretch($callback);
        $end_time = microtime(true);

        $elapsed_time = ($end_time - $start_time); // in microseconds (us)
        $expected_duration_in_us = (0.002);

        $this->assertGreaterThanOrEqual($expected_duration_in_us, ($end_time - $start_time));
    }

    protected function getTestCallbackWithLength(int $duration_in_ms, bool $should_halt = false): callable
    {
        return static function () use ($duration_in_ms, $should_halt) {
            usleep(1_000 * $duration_in_ms);
            if ($should_halt) {
                exit;
            }
        };
    }
}