class DrupalDateTimeTest

class DrupalDateTimeTest extends BrowserTestBase {
  
  /**
   * Set up required modules.
   */
  protected static $modules = [];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Test setup.
   */
  protected function setUp() : void {
    parent::setUp();
  }
  
  /**
   * Tests that DrupalDateTime can detect the right timezone to use.
   *
   * Test with a variety of less commonly used timezone names to
   * help ensure that the system timezone will be different than the
   * stated timezones.
   */
  public function testDateTimezone() {
    $date_string = '2007-01-31 21:00:00';
    // Make sure no site timezone has been set.
    $this->config('system.date')
      ->set('timezone.user.configurable', 0)
      ->set('timezone.default', NULL)
      ->save();
    // Detect the system timezone.
    $system_timezone = date_default_timezone_get();
    // Create a date object with an unspecified timezone, which should
    // end up using the system timezone.
    $date = new DrupalDateTime($date_string);
    $timezone = $date->getTimezone()
      ->getName();
    $this->assertSame($system_timezone, $timezone, 'DrupalDateTime uses the system timezone when there is no site timezone.');
    // Create a date object with a specified timezone.
    $date = new DrupalDateTime($date_string, 'America/Yellowknife');
    $timezone = $date->getTimezone()
      ->getName();
    $this->assertSame('America/Yellowknife', $timezone, 'DrupalDateTime uses the specified timezone if provided.');
    // Set a site timezone.
    $this->config('system.date')
      ->set('timezone.default', 'Europe/Warsaw')
      ->save();
    // Create a date object with an unspecified timezone, which should
    // end up using the site timezone.
    $date = new DrupalDateTime($date_string);
    $timezone = $date->getTimezone()
      ->getName();
    $this->assertSame('Europe/Warsaw', $timezone, 'DrupalDateTime uses the site timezone if provided.');
    // Create user.
    $this->config('system.date')
      ->set('timezone.user.configurable', 1)
      ->save();
    $test_user = $this->drupalCreateUser([]);
    $this->drupalLogin($test_user);
    // Set up the user with a different timezone than the site.
    $edit = [
      'mail' => $test_user->getEmail(),
      'timezone' => 'Asia/Manila',
    ];
    $this->drupalGet('user/' . $test_user->id() . '/edit');
    $this->submitForm($edit, 'Save');
    // Reload the user and reset the timezone in AccountProxy::setAccount().
    \Drupal::entityTypeManager()->getStorage('user')
      ->resetCache();
    $this->container
      ->get('current_user')
      ->setAccount(User::load($test_user->id()));
    // Create a date object with an unspecified timezone, which should
    // end up using the user timezone.
    $date = new DrupalDateTime($date_string);
    $timezone = $date->getTimezone()
      ->getName();
    $this->assertSame('Asia/Manila', $timezone, 'DrupalDateTime uses the user timezone, if configurable timezones are used and it is set.');
  }
  
  /**
   * Tests the ability to override the time zone in the format method.
   */
  public function testTimezoneFormat() {
    // Create a date in UTC
    $date = DrupalDateTime::createFromTimestamp(87654321, 'UTC');
    // Verify that the date format method displays the default time zone.
    $this->assertEquals('1972/10/11 12:25:21 UTC', $date->format('Y/m/d H:i:s e'), 'Date has default UTC time zone and correct date/time.');
    // Verify that the format method can override the time zone.
    $this->assertEquals('1972/10/11 08:25:21 America/New_York', $date->format('Y/m/d H:i:s e', [
      'timezone' => 'America/New_York',
    ]), 'Date displayed overridden time zone and correct date/time');
    // Verify that the date format method still displays the default time zone
    // for the date object.
    $this->assertEquals('1972/10/11 12:25:21 UTC', $date->format('Y/m/d H:i:s e'), 'Date still has default UTC time zone and correct date/time');
  }

}