Issue #2905818 by Wim Leers, Lendude: Make sure \Drupal\Tests\BrowserTestBase::checkForMetaRefresh is case insensitive

core/modules/system/tests/modules/test_page_test/src/Controller/Test.php

@@ -1,6 +1,9 @@
 <?php
 
 namespace Drupal\test_page_test\Controller;
+
+use Drupal\Core\Url;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 
 /**
@@ -108,4 +111,16 @@ class Test {
     return ['#markup' => '<a href="http://example.com">foo|bar|baz</a>'];
   }
 
+  /**
+   * Loads a page that does a redirect.
+   *
+   * Drupal uses Symfony's RedirectResponse for generating redirects. That class
+   * uses a lower-case 'http-equiv="refresh"'.
+   *
+   * @see \Symfony\Component\HttpFoundation\RedirectResponse
+   */
+  public function metaRefresh() {
+    return new RedirectResponse(Url::fromRoute('test_page_test.test_page', [], ['absolute' => TRUE])->toString(), 302);
+  }
+
 }

core/modules/system/tests/modules/test_page_test/test_page_test.routing.yml

@@ -82,3 +82,11 @@ test_page_test.field_xpath:
     _form: '\Drupal\test_page_test\Form\TestForm'
   requirements:
     _access: 'TRUE'
+
+test_page_test.meta_refresh:
+  path: '/test-meta-refresh'
+  defaults:
+    _title: 'Page with a redirect'
+    _controller: '\Drupal\test_page_test\Controller\Test::metaRefresh'
+  requirements:
+    _access: 'TRUE'

core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php

@@ -605,4 +605,22 @@ class BrowserTestBaseTest extends BrowserTestBase {
     $this->assertEquals('Australia/Sydney', $value);
   }
 
+  /**
+   * Tests the ::checkForMetaRefresh() method.
+   */
+  public function testCheckForMetaRefresh() {
+    // Disable following redirects in the client.
+    $this->getSession()->getDriver()->getClient()->followRedirects(FALSE);
+    // Set the maximumMetaRefreshCount to zero to make sure the redirect doesn't
+    // happen when doing a drupalGet.
+    $this->maximumMetaRefreshCount = 0;
+    $this->drupalGet('test-meta-refresh');
+    $this->assertNotEmpty($this->cssSelect('meta[http-equiv="refresh"]'));
+    // Allow one redirect to happen.
+    $this->maximumMetaRefreshCount = 1;
+    $this->checkForMetaRefresh();
+    // Check that we are now on the test page.
+    $this->assertSession()->pageTextContains('Test page text.');
+  }
+
 }

core/tests/Drupal/Tests/BrowserTestBase.php

@@ -1267,13 +1267,13 @@ abstract class BrowserTestBase extends TestCase {
    * Checks for meta refresh tag and if found call drupalGet() recursively.
    *
    * This function looks for the http-equiv attribute to be set to "Refresh" and
-   * is case-sensitive.
+   * is case-insensitive.
    *
    * @return string|false
    *   Either the new page content or FALSE.
    */
   protected function checkForMetaRefresh() {
-    $refresh = $this->cssSelect('meta[http-equiv="Refresh"]');
+    $refresh = $this->cssSelect('meta[http-equiv="Refresh"], meta[http-equiv="refresh"]');
     if (!empty($refresh) && (!isset($this->maximumMetaRefreshCount) || $this->metaRefreshCount < $this->maximumMetaRefreshCount)) {
       // Parse the content attribute of the meta tag for the format:
       // "[delay]: URL=[page_to_redirect_to]".