debug

tests/src/Build/CoreUpdateTest.php

@@ -195,7 +195,13 @@ class CoreUpdateTest extends UpdateTestBase {
     $assert_session->pageTextNotContains('There is a security update available for your version of Drupal.');
     $page->pressButton('Update');
     $this->waitForBatchJob();
-    $assert_session->pageTextContains('Ready to update');
+    try {
+      $assert_session->pageTextContains('Ready to update');
+    }
+    catch (\Throwable $e) {
+      print_r($page->getContent());
+      throw $e;
+    }
     $page->pressButton('Continue');
     $this->waitForBatchJob();
     $assert_session->pageTextContains('Update complete!');