FormatDateTest.php

<?php

namespace Drupal\Tests\system\Functional\Common;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests the DateFormatterInterface::format() function.
 *
 * @group Common
 */
class FormatDateTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests admin-defined formats in DateFormatterInterface::format().
     */
    public function testAdminDefinedFormatDate() {
        // Create and log in an admin user.
        $this->drupalLogin($this->drupalCreateUser([
            'administer site configuration',
        ]));
        // Add new date format.
        $edit = [
            'id' => 'example_style',
            'label' => 'Example Style',
            'date_format_pattern' => 'j M y',
        ];
        $this->drupalGet('admin/config/regional/date-time/formats/add');
        $this->submitForm($edit, 'Add format');
        // Add a second date format with a different case than the first.
        $edit = [
            'id' => 'example_style_uppercase',
            'label' => 'Example Style Uppercase',
            'date_format_pattern' => 'j M Y',
        ];
        $this->drupalGet('admin/config/regional/date-time/formats/add');
        $this->submitForm($edit, 'Add format');
        $this->assertSession()
            ->pageTextContains('Custom date format added.');
        
        /** @var \Drupal\Core\Datetime\DateFormatterInterface $date_formatter */
        $date_formatter = $this->container
            ->get('date.formatter');
        $timestamp = strtotime('2007-03-10T00:00:00+00:00');
        $this->assertSame($date_formatter->format($timestamp, 'example_style', '', 'America/Los_Angeles'), '9 Mar 07');
        $this->assertSame($date_formatter->format($timestamp, 'example_style_uppercase', '', 'America/Los_Angeles'), '9 Mar 2007');
        $this->assertSame($date_formatter->format($timestamp, 'undefined_style'), $date_formatter->format($timestamp, 'fallback'), 'Test DateFormatterInterface::format() defaulting to `fallback` when $type not found.');
    }

}