TimezoneTest.php

<?php

namespace Drupal\Tests\system\Kernel\Timezone;

use Drupal\KernelTests\KernelTestBase;

/**
 * Test coverage for time zone handling.
 *
 * @group system
 */
class TimezoneTest extends KernelTestBase {
    public static $modules = [
        'system',
    ];
    
    /**
     * Tests system_time_zones().
     */
    public function testSystemTimeZones() {
        // Test the default parameters for system_time_zones().
        $result = system_time_zones();
        $this->assertIsArray($result);
        $this->assertArrayHasKey('Africa/Dar_es_Salaam', $result);
        $this->assertEquals('Africa/Dar es Salaam', $result['Africa/Dar_es_Salaam']);
        // Tests time zone grouping.
        $result = system_time_zones(NULL, TRUE);
        // Check a two-level time zone.
        $this->assertIsArray($result);
        $this->assertArrayHasKey('Africa', $result);
        $this->assertArrayHasKey('Africa/Dar_es_Salaam', $result['Africa']);
        $this->assertEquals('Dar es Salaam', $result['Africa']['Africa/Dar_es_Salaam']);
        // Check a three level time zone.
        $this->assertArrayHasKey('America', $result);
        $this->assertArrayHasKey('America/Indiana/Indianapolis', $result['America']);
        $this->assertEquals('Indianapolis (Indiana)', $result['America']['America/Indiana/Indianapolis']);
        // Make sure grouping hasn't erroneously created an entry with just the
        // first and second levels.
        $this->assertArrayNotHasKey('America/Indiana', $result['America']);
        // Make sure grouping hasn't duplicated an entry with just the first and
        // third levels.
        $this->assertArrayNotHasKey('America/Indianapolis', $result['America']);
        // Make sure that a grouped item isn't duplicated at the top level of the
        // results array.
        $this->assertArrayNotHasKey('America/Indiana/Indianapolis', $result);
        // Test that the ungrouped and grouped results have the same number of
        // items.
        $ungrouped_count = count(system_time_zones());
        $grouped_result = system_time_zones(NULL, TRUE);
        $grouped_count = 0;
        array_walk_recursive($grouped_result, function () use (&$grouped_count) {
            $grouped_count++;
        });
        $this->assertEquals($ungrouped_count, $grouped_count);
    }

}