DefaultFormatTest.php

<?php

namespace Drupal\FunctionalTests\Routing;

use Drupal\Tests\BrowserTestBase;

/**
 * @group routing
 */
class DefaultFormatTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  public static $modules = [
    'system',
    'default_format_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  public function testFoo() {
    $this->drupalGet('/default_format_test/human');
    $this->assertSame('format:html', $this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame('MISS', $this->drupalGetHeader('X-Drupal-Cache'));
    $this->drupalGet('/default_format_test/human');
    $this->assertSame('format:html', $this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame('HIT', $this->drupalGetHeader('X-Drupal-Cache'));
    $this->drupalGet('/default_format_test/machine');
    $this->assertSame('format:json', $this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame('MISS', $this->drupalGetHeader('X-Drupal-Cache'));
    $this->drupalGet('/default_format_test/machine');
    $this->assertSame('format:json', $this->getSession()
      ->getPage()
      ->getContent());
    $this->assertSame('HIT', $this->drupalGetHeader('X-Drupal-Cache'));
  }
  public function testMultipleRoutesWithSameSingleFormat() {
    $this->drupalGet('/default_format_test/machine');
    $this->assertSame('format:json', $this->getSession()
      ->getPage()
      ->getContent());
  }

}