only in patch2:
unchanged:
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -21,6 +21,16 @@
    */
   protected function deprecationEndTest($test, $time) {
     /** @var \PHPUnit\Framework\Test $test */
+    $util_test_class = class_exists('PHPUnit_Util_Test') ? 'PHPUnit_Util_Test' : 'PHPUnit\Util\Test';
+    $method = $test->getName();
+    if (strpos($method, 'testLegacy') === 0
+      || strpos($method, 'provideLegacy') === 0
+      || strpos($method, 'getLegacy') === 0
+      || strpos(get_class($test), '\Legacy')
+      || in_array('legacy', $util_test_class::getGroups(get_class($test), $method), TRUE)) {
+      // This is a legacy test don't skip deprecations.
+      return;
+    }
     // Need to edit the file of deprecations.
     if ($file = getenv('SYMFONY_DEPRECATIONS_SERIALIZE')) {
       $deprecations = file_get_contents($file);