BlogPostController.php

<?php

namespace App\Tests;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class BlogPostsControllerTest extends WebTestCase {
 
    public function testShowPost() {
        $client = static::createClient();
        $client->followRedirects();
        
        $crawler = $client->request('GET', 'blog');
        $this->assertSame('My awesome blog', $crawler->filter('h1')->text());
        $this->assertEquals(1, $crawler->filter('.container .posts')->count());
    }
}