class UserTimeZoneTest

class UserTimeZoneTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'system_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests the display of dates and time when user-configurable time zones are set.
     */
    public function testUserTimeZone() : void {
        // Setup date/time settings for Los Angeles time.
        $this->config('system.date')
            ->set('timezone.user.configurable', 1)
            ->set('timezone.default', 'America/Los_Angeles')
            ->save();
        // Load the 'medium' date format, which is the default for node creation
        // time, and override it. Since we are testing time zones with Daylight
        // Saving Time, and need to future proof against changes to the zoneinfo
        // database, we choose the 'I' format placeholder instead of a
        // human-readable zone name. With 'I', a 1 means the date is in DST, and 0
        // if not.
        DateFormat::load('medium')->setPattern('Y-m-d H:i I')
            ->save();
        // Create a user account and login.
        $web_user = $this->drupalCreateUser();
        $this->drupalLogin($web_user);
        // Create some nodes with different authored-on dates.
        // Two dates in PST (winter time):
        $date1 = '2007-03-09 21:00:00 -0800';
        $date2 = '2007-03-11 01:00:00 -0800';
        // One date in PDT (summer time):
        $date3 = '2007-03-20 21:00:00 -0700';
        $this->drupalCreateContentType([
            'type' => 'article',
        ]);
        $node1 = $this->drupalCreateNode([
            'created' => strtotime($date1),
            'type' => 'article',
        ]);
        $node2 = $this->drupalCreateNode([
            'created' => strtotime($date2),
            'type' => 'article',
        ]);
        $node3 = $this->drupalCreateNode([
            'created' => strtotime($date3),
            'type' => 'article',
        ]);
        // Confirm date format and time zone.
        $this->drupalGet('node/' . $node1->id());
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2007-03-09 21:00 0');
        $this->drupalGet('node/' . $node2->id());
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2007-03-11 01:00 0');
        $this->drupalGet('node/' . $node3->id());
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2007-03-20 21:00 1');
        // Change user time zone to Santiago time.
        $edit = [];
        $edit['mail'] = $web_user->getEmail();
        $edit['timezone'] = 'America/Santiago';
        $this->drupalGet("user/" . $web_user->id() . "/edit");
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->pageTextContains('The changes have been saved.');
        // Confirm date format and time zone.
        $this->drupalGet('node/' . $node1->id());
        // Date should be Chile summer time, five hours ahead of PST.
        $this->assertSession()
            ->pageTextContains('2007-03-10 02:00 1');
        $this->drupalGet('node/' . $node2->id());
        // Date should be Chile time, four hours ahead of PST.
        $this->assertSession()
            ->pageTextContains('2007-03-11 05:00 0');
        $this->drupalGet('node/' . $node3->id());
        // Date should be Chile time, three hours ahead of PDT.
        $this->assertSession()
            ->pageTextContains('2007-03-21 00:00 0');
        // Ensure that anonymous users also use the default timezone.
        $this->drupalLogout();
        $this->drupalGet('node/' . $node1->id());
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2007-03-09 21:00 0');
        $this->drupalGet('node/' . $node2->id());
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2007-03-11 01:00 0');
        $this->drupalGet('node/' . $node3->id());
        // Date should be PDT.
        $this->assertSession()
            ->pageTextContains('2007-03-20 21:00 1');
        // Format a date without accessing the current user at all and
        // ensure that it uses the default timezone.
        $this->drupalGet('/system-test/date');
        // Date should be PST.
        $this->assertSession()
            ->pageTextContains('2016-01-13 08:29 0');
    }

}