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symfony/src/Symfony/Component/DependencyInjection/Tests/Argument/RewindableGeneratorTest.php

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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection\Tests\Argument;
use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
class RewindableGeneratorTest extends \PHPUnit_Framework_TestCase
{
public function testImplementsCountable()
{
$this->assertInstanceOf(\Countable::class, new RewindableGenerator(function () {
yield 1;
}, 1));
}
public function testCountUsesProvidedValue()
{
$generator = new RewindableGenerator(function () {
yield 1;
}, 3);
$this->assertCount(3, $generator);
}
public function testCountUsesProvidedValueAsCallback()
{
$called = 0;
$generator = new RewindableGenerator(function () {
yield 1;
}, function () use (&$called) {
++$called;
return 3;
});
$this->assertSame(0, $called, 'Count callback is called lazily');
$this->assertCount(3, $generator);
count($generator);
$this->assertSame(1, $called, 'Count callback is called only once');
}
}