--- /dev/null
+<?php
+
+namespace Drupal\Tests\user\Functional\Views;
+
+use Drupal\views\Views;
+
+/**
+ * Tests the handler of the user: uid Argument.
+ *
+ * @group user
+ */
+class HandlerArgumentUserUidTest extends UserTestBase {
+
+ /**
+ * Views used by this test.
+ *
+ * @var array
+ */
+ public static $testViews = ['test_user_uid_argument'];
+
+ /**
+ * Tests the generated title of an user: uid argument.
+ */
+ public function testArgumentTitle() {
+ $view = Views::getView('test_user_uid_argument');
+
+ // Tests an invalid user uid.
+ $this->executeView($view, [rand(1000, 10000)]);
+ $this->assertFalse($view->getTitle());
+ $view->destroy();
+
+ // Tests a valid user.
+ $account = $this->drupalCreateUser();
+ $this->executeView($view, [$account->id()]);
+ $this->assertEqual($view->getTitle(), $account->label());
+ $view->destroy();
+
+ // Tests the anonymous user.
+ $anonymous = $this->config('user.settings')->get('anonymous');
+ $this->executeView($view, [0]);
+ $this->assertEqual($view->getTitle(), $anonymous);
+ $view->destroy();
+
+ $view->getDisplay()->getHandler('argument', 'uid')->options['break_phrase'] = TRUE;
+ $this->executeView($view, [$account->id() . ',0']);
+ $this->assertEqual($view->getTitle(), $account->label() . ', ' . $anonymous);
+ $view->destroy();
+
+ $view->getDisplay()->getHandler('argument', 'uid')->options['break_phrase'] = TRUE;
+ $this->executeView($view, ['0,' . $account->id()]);
+ $this->assertEqual($view->getTitle(), $anonymous . ', ' . $account->label());
+ $view->destroy();
+ }
+
+}