Issue #3437566 by mondrake, longwave, catch, smustgrave, alexpott: Refactor...

namespace Drupal\Core\Config;

use Drupal\Component\Render\FormattableMarkup;

use Drupal\Component\Utility\NestedArray;

use Drupal\Core\Cache\CacheBackendInterface;

use Drupal\Core\Config\Schema\ConfigSchemaAlterException;

    $data = $this->configStorage->read($name);

    if ($data === FALSE) {

      // For a typed config the data MUST exist.

      $data = [];

      trigger_error(new FormattableMarkup('Missing required data for typed configuration: @config', [

        '@config' => $name,

      ]), E_USER_ERROR);

      throw new \InvalidArgumentException("Missing required data for typed configuration: $name");

    }

    return $this->createFromNameAndData($name, $data);

  }

use Drupal\Core\TypedData\Type\IntegerInterface;

use Drupal\Core\TypedData\Type\StringInterface;

use Drupal\KernelTests\KernelTestBase;

use PHPUnit\Framework\Error\Error;

use Symfony\Component\Validator\ConstraintViolationListInterface;

/**

      $typed_config_manager->get('config_test.non_existent');

      $this->fail('Expected error when trying to get non-existent typed config.');

    }

    catch (Error $e) {

    catch (\InvalidArgumentException $e) {

      $this->assertEquals('Missing required data for typed configuration: config_test.non_existent', $e->getMessage());

    }