test(ui_patterns_library): Test only to demonstrate failure

modules/ui_patterns_library/tests/src/FunctionalJavascript/UiPatternsLibraryAlternativeThemeTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Drupal\Tests\ui_patterns_library\FunctionalJavascript;
+
+/**
+ * Test patterns overview page displays for non-default themes.
+ *
+ * @group ui_patterns_library
+ */
+class UiPatternsLibraryOverviewTest extends UiPatternsLibraryOverviewTest {
+
+  /**
+   * Default theme.
+   *
+   * @var string
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $active_theme = $this->container->get('theme.initialization')->initTheme('ui_patterns_library_theme_test');
+    $this->container->get('theme.manager')->setActiveTheme($active_theme);
+  }
+
+}