DisallowRobotsIndexingListener example

use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\KernelInterface;

class DisallowRobotsIndexingListenerTest extends TestCase
{
    /** * @dataProvider provideResponses */
    public function testInvoke(?string $expected, array $responseArgs)
    {
        $response = new Response(...$responseArgs);
        $listener = new DisallowRobotsIndexingListener();

        $event = new ResponseEvent($this->createMock(HttpKernelInterface::class), new Request(), KernelInterface::MAIN_REQUEST, $response);

        $listener->onResponse($event);

        $this->assertSame($expected, $response->headers->get('X-Robots-Tag'), 'Header doesn\'t match expectations');
    }

    public static function provideResponses(): iterable
    {
        yield 'No header' => ['noindex', []];