Fix SUT tests

Author: Chi-teck

templates/d8/test/browser.twig

@@ -11,6 +11,11 @@ use Drupal\Tests\BrowserTestBase;
  */
 class {{ class }} extends BrowserTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stable';
+
   /**
    * {@inheritdoc}
    */

templates/d8/test/webdriver.twig

@@ -11,6 +11,11 @@ use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
  */
 class {{ class }} extends WebDriverTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stable';
+
   /**
    * {@inheritdoc}
    */

tests/dcg/Generator/Drupal_8/Test/_browser.php

@@ -11,6 +11,11 @@
  */
 class ExampleTest extends BrowserTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stable';
+
   /**
    * {@inheritdoc}
    */

tests/dcg/Generator/Drupal_8/Test/_webdriver.php

@@ -11,6 +11,11 @@
  */
 class ExampleTest extends WebDriverTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stable';
+
   /**
    * {@inheritdoc}
    */

tests/sut/zippo/tests/src/Functional/ThemeNegotiatorTest.php

@@ -11,6 +11,11 @@
  */
 class ThemeNegotiatorTest extends BrowserTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
   /**
    * {@inheritdoc}
    */