Fix test performance of \Drupal\Tests\config\Functional\ConfigImportAllTest

Closes #3405095

core/modules/config/tests/src/Functional/ConfigImportAllTest.php

@@ -29,13 +29,21 @@ class ConfigImportAllTest extends ModuleTestBase {
   protected $webUser;
 
   /**
-   * The profile to install as a basis for testing.
+   * Modules to enable.
    *
-   * Using the standard profile as this has a lot of additional configuration.
-   *
-   * @var string
+   * @var array
+   */
+  protected static $modules = ['config'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
    */
-  protected $profile = 'standard';
+  protected $profile = 'testing';
 
   /**
    * {@inheritdoc}
@@ -100,7 +108,7 @@ public function testInstallUninstall() {
 
     $all_modules = \Drupal::service('extension.list.module')->getList();
     $database_module = \Drupal::service('database')->getProvider();
-    $expected_modules = ['path_alias', 'system', 'user', 'standard', $database_module];
+    $expected_modules = ['path_alias', 'system', 'user', 'testing', $database_module];
 
     // Ensure that only core required modules and the install profile can not be uninstalled.
     $validation_reasons = \Drupal::service('module_installer')->validateUninstall(array_keys($all_modules));