Issue #3042538 by claudiu.cristea, Lendude: Convert ArgumentDefaultTest into a kernel test

core/modules/user/tests/src/Functional/Views/ArgumentDefaultTest.php → core/modules/user/tests/src/Kernel/Views/ArgumentDefaultTest.php

 <?php
 
-namespace Drupal\Tests\user\Functional\Views;
+namespace Drupal\Tests\user\Kernel\Views;
 
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\Tests\user\Traits\UserCreationTrait;
+use Drupal\views\Tests\ViewTestData;
 use Drupal\views\Views;
 
 /**
@@ -9,7 +12,20 @@
  *
  * @group user
  */
-class ArgumentDefaultTest extends UserTestBase {
+class ArgumentDefaultTest extends KernelTestBase {
+
+  use UserCreationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'node',
+    'system',
+    'user',
+    'user_test_views',
+    'views',
+  ];
 
   /**
    * Views used by this test.
@@ -18,19 +34,24 @@ class ArgumentDefaultTest extends UserTestBase {
    */
   public static $testViews = ['test_plugin_argument_default_current_user'];
 
-  public function test_plugin_argument_default_current_user() {
+  /**
+   * Tests the current user with argument default.
+   */
+  public function testPluginArgumentDefaultCurrentUser() {
+    $this->installSchema('system', ['sequences']);
+    $this->installEntitySchema('user');
+    ViewTestData::createTestViews(get_class($this), ['user_test_views']);
+
     // Create a user to test.
-    $account = $this->drupalCreateUser();
+    $account = $this->createUser();
 
     // Switch the user.
-    \Drupal::service('account_switcher')->switchTo($account);
+    $this->container->get('account_switcher')->switchTo($account);
 
     $view = Views::getView('test_plugin_argument_default_current_user');
     $view->initHandlers();
 
-    $this->assertEqual($view->argument['null']->getDefaultArgument(), $account->id(), 'Uid of the current user is used.');
-    // Switch back.
-    \Drupal::service('account_switcher')->switchBack();
+    $this->assertEquals($account->id(), $view->argument['null']->getDefaultArgument(), 'Uid of the current user is used.');
   }
 
 }