CacheWarmerAggregate example

use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerAggregate;
use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;

class CacheWarmerAggregateTest extends TestCase
{
    public function testInjectWarmersUsingConstructor()
    {
        $warmer = $this->createMock(CacheWarmerInterface::class);
        $warmer
            ->expects($this->once())
            ->method('warmUp');
        $aggregate = new CacheWarmerAggregate([$warmer]);
        $aggregate->warmUp(__DIR__);
    }

    public function testWarmupDoesCallWarmupOnOptionalWarmersWhenEnableOptionalWarmersIsEnabled()
    {
        $warmer = $this->createMock(CacheWarmerInterface::class);
        $warmer
            ->expects($this->never())
            ->method('isOptional');
        $warmer
            ->expects($this->once())