Issue #3294236 by lussoluca: Move level mapping between rfc and monolog upstream

namespace Drupal\Tests\monolog\Unit\Logger;

use Drupal\Core\DependencyInjection\Container;

use Drupal\Core\Messenger\MessengerInterface;

use Drupal\monolog\Logger\Handler\DrupalHandler;

use Drupal\monolog\Logger\MonologLoggerChannelFactory;

use Drupal\Tests\UnitTestCase;

    $rotating_file_push_processor,

    $drupal_push_processor

  ) {

    $channelFactory = new MonologLoggerChannelFactory();

    $messenger = $this->getMockBuilder(MessengerInterface::class)

      ->getMock();

    $channelFactory = new MonologLoggerChannelFactory($messenger);

    $channelFactory

      ->setContainer(

        $this->getMockContainer(