Issue #3298923 by andypost, Berdir: Fix...

namespace Drupal\Tests\user\Unit\Plugin\Validation\Constraint;

use Drupal\Tests\UnitTestCase;

use Drupal\user\Entity\User;

use Drupal\user\Plugin\Validation\Constraint\ProtectedUserFieldConstraint;

use Drupal\user\Plugin\Validation\Constraint\ProtectedUserFieldConstraintValidator;

use Symfony\Component\Validator\Context\ExecutionContextInterface;

    // Case 3: Account flagged to skip protected user should be ignored.

    $field_definition = $this->createMock('Drupal\Core\Field\FieldDefinitionInterface');

    $account = $this->createMock('Drupal\user\UserInterface');

    $account = $this->createMock(User::class);

    $account->_skipProtectedUserFieldConstraint = TRUE;

    $items = $this->createMock('Drupal\Core\Field\FieldItemListInterface');

    $items->expects($this->once())