Michael Strelan
--- a/core/modules/help/tests/src/Functional/HelpTest.php → core/modules/help/tests/src/Kernel/HelpTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTest.php → core/modules/help/tests/src/Kernel/HelpTest.php

    // Make sure links are properly added for modules implementing hook_help().
    foreach ($this->getModuleList() as $module => $name) {
-      $this->assertSession()->linkExists($name, 0, new FormattableMarkup('Link properly added to @name (admin/help/@module)', ['@module' => $module, '@name' => $name]));
+      $this->assertSession()->linkExists($name, 0, new FormattableMarkup('Link properly added to @name (admin/help/@module)', [
+        '@module' => $module,
+        '@name' => $name,
+      ]));
    }

    // Ensure a module which does not provide a module overview page is handled
    // correctly.
    $module_name = \Drupal::service('extension.list.module')->getName('help_test');
-    $this->clickLink($module_name);
+    $link = $this->getSession()->getPage()->find('named', ['link', $module_name]);
+    $this->drupalGet($link->getAttribute('href'));
--- a/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php

    // Verify that the "no test" user, who should not be able to access
    // the 'valid link' URL, sees it as not a link.
-    $this->drupalLogin($this->noTestUser);
-    $this->drupalGet('admin/help/topic/help_topics_test.test_urls');
+    $this->setCurrentUser($this->noTestUser);
+    $this->drupalGet('/admin/help/topic/help_topics_test.test_urls');
--- a/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php
      'admin/config/system' => 'System',
    ];
-    $this->assertBreadcrumb('admin/config/system/site-information', $trail);
+    $this->assertBreadcrumb('/admin/config/system/site-information', $trail);
+  }
+
+  /**
+   * Overrides AssertContentTrait for use in Kernel tests.
+   *
+   * @see \Drupal\KernelTests\AssertContentTrait::xpath()
+   * @see \Drupal\Tests\BrowserTestBase::xpath()
+   */
+  protected function xpath($xpath, array $arguments = []): array {
+    $xpath = $this->assertSession()->buildXPathQuery($xpath, $arguments);
+    return $this->getSession()->getPage()->findAll('xpath', $xpath);
+  }
--- a/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTopicTest.php → core/modules/help/tests/src/Kernel/HelpTopicTest.php
+   *
+   * @see \Drupal\KernelTests\AssertContentTrait::xpath()
+   * @see \Drupal\Tests\BrowserTestBase::xpath()
+   */
+  protected function xpath($xpath, array $arguments = []): array {
+    $xpath = $this->assertSession()->buildXPathQuery($xpath, $arguments);
+    return $this->getSession()->getPage()->findAll('xpath', $xpath);
+  }
+
+  /**
+   * Get the current URL from the browser.
+   *
+   * @see \Drupal\Tests\UiHelperTrait::getUrl
+   */
+  protected function getUrl(): string {
+    return $this->getSession()->getCurrentUrl();