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web/core/tests/Drupal/FunctionalTests/Theme/BartikTest.php

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+<?php
+
+namespace Drupal\FunctionalTests\Theme;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the Bartik theme.
+ *
+ * @group bartik
+ */
+class BartikTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $this->assertTrue($this->container->get('theme_installer')->install(['bartik']));
+    $this->container->get('config.factory')
+      ->getEditable('system.theme')
+      ->set('default', 'bartik')
+      ->save();
+  }
+
+  /**
+   * Tests that the Bartik theme always adds its message CSS and Classy's.
+   *
+   * @see bartik.libraries.yml
+   * @see classy.info.yml
+   */
+  public function testRegressionMissingMessagesCss() {
+    $this->drupalGet('');
+    $this->assertSession()->statusCodeEquals(200);
+    $this->assertSession()->responseContains('bartik/css/components/messages.css');
+    $this->assertSession()->responseContains('classy/css/components/messages.css');
+  }
+
+}

web/core/tests/Drupal/FunctionalTests/Theme/ClassyTest.php

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+<?php
+
+namespace Drupal\FunctionalTests\Theme;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the classy theme.
+ *
+ * @group classy
+ */
+class ClassyTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $this->assertTrue($this->container->get('theme_installer')->install(['classy']));
+    $this->container->get('config.factory')
+      ->getEditable('system.theme')
+      ->set('default', 'classy')
+      ->save();
+  }
+
+  /**
+   * Tests that the Classy theme always adds its message CSS.
+   *
+   * @see classy.info.yml
+   */
+  public function testRegressionMissingMessagesCss() {
+    $this->drupalGet('');
+    $this->assertSession()->statusCodeEquals(200);
+    $this->assertSession()->responseContains('classy/css/components/messages.css');
+  }
+
+}