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CrawlerSelectorExists example

use PHPUnit\Framework\ExpectationFailedException;
use PHPUnit\Framework\TestCase;
use PHPUnit\Framework\TestFailure;
use Symfony\Component\DomCrawler\Crawler;
use Symfony\Component\DomCrawler\Test\Constraint\CrawlerSelectorExists;

class CrawlerSelectorExistsTest extends TestCase
{
    public function testConstraint()
    {
        $constraint = new CrawlerSelectorExists('title');
        $this->assertTrue($constraint->evaluate(new Crawler('<html><head><title>'), '', true));
        $constraint = new CrawlerSelectorExists('h1');
        $this->assertFalse($constraint->evaluate(new Crawler('<html><head><title>'), '', true));

        try {
            $constraint->evaluate(new Crawler('<html><head><title>'));
        } catch (ExpectationFailedException $e) {
            $this->assertEquals("Failed asserting that the Crawler matches selector \"h1\".\n", TestFailure::exceptionToString($e));

            return;
        }

use Symfony\Component\DomCrawler\Test\Constraint\CrawlerSelectorExists;

/** * Ideas borrowed from Laravel Dusk's assertions. * * @see https://laravel.com/docs/5.7/dusk#available-assertions */
trait DomCrawlerAssertionsTrait
{
    public static function assertSelectorExists(string $selector, string $message = ''): void
    {
        self::assertThat(self::getCrawler(), new DomCrawlerConstraint\CrawlerSelectorExists($selector), $message);
    }

    public static function assertSelectorNotExists(string $selector, string $message = ''): void
    {
        self::assertThat(self::getCrawler(), new LogicalNot(new DomCrawlerConstraint\CrawlerSelectorExists($selector)), $message);
    }

    public static function assertSelectorCount(int $expectedCount, string $selector, string $message = ''): void
    {
        self::assertThat(self::getCrawler(), new DomCrawlerConstraint\CrawlerSelectorCount($expectedCount, $selector), $message);
    }