--- /dev/null
+<?php
+
+namespace Drupal\Tests\user\Functional\Views;
+
+use Drupal\Core\Form\FormState;
+use Drupal\views\Plugin\views\argument\ArgumentPluginBase;
+use Drupal\views\Views;
+
+/**
+ * Tests user argument validators for ID and name.
+ *
+ * @group user
+ */
+class ArgumentValidateTest extends UserTestBase {
+
+ /**
+ * Views used by this test.
+ *
+ * @var array
+ */
+ public static $testViews = ['test_view_argument_validate_user', 'test_view_argument_validate_username'];
+
+ /**
+ * A user for this test.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $account;
+
+ protected function setUp($import_test_views = TRUE) {
+ parent::setUp($import_test_views);
+
+ $this->account = $this->drupalCreateUser();
+ }
+
+ /**
+ * Tests the User (ID) argument validator.
+ */
+ public function testArgumentValidateUserUid() {
+ $account = $this->account;
+
+ $view = Views::getView('test_view_argument_validate_user');
+ $this->executeView($view);
+
+ $this->assertTrue($view->argument['null']->validateArgument($account->id()));
+ // Reset argument validation.
+ $view->argument['null']->argument_validated = NULL;
+ // Fail for a valid numeric, but for a user that doesn't exist
+ $this->assertFalse($view->argument['null']->validateArgument(32));
+
+ $form = [];
+ $form_state = new FormState();
+ $view->argument['null']->buildOptionsForm($form, $form_state);
+ $sanitized_id = ArgumentPluginBase::encodeValidatorId('entity:user');
+ $this->assertTrue($form['validate']['options'][$sanitized_id]['roles']['#states']['visible'][':input[name="options[validate][options][' . $sanitized_id . '][restrict_roles]"]']['checked']);
+ }
+
+ /**
+ * Tests the UserName argument validator.
+ */
+ public function testArgumentValidateUserName() {
+ $account = $this->account;
+
+ $view = Views::getView('test_view_argument_validate_username');
+ $this->executeView($view);
+
+ $this->assertTrue($view->argument['null']->validateArgument($account->getUsername()));
+ // Reset argument validation.
+ $view->argument['null']->argument_validated = NULL;
+ // Fail for a valid string, but for a user that doesn't exist
+ $this->assertFalse($view->argument['null']->validateArgument($this->randomMachineName()));
+ }
+
+}