only in patch2:
unchanged:
--- a/core/modules/block/src/Tests/BlockUiTest.php
+++ b/core/modules/block/src/Tests/BlockUiTest.php
@@ -58,14 +58,12 @@ protected function setUp() {
     $this->blockValues = array(
       array(
         'label' => 'Tools',
-        'tr' => '5',
         'plugin_id' => 'system_menu_block:tools',
         'settings' => array('region' => 'sidebar_second', 'id' => 'tools'),
         'test_weight' => '-1',
       ),
       array(
         'label' => 'Powered by Drupal',
-        'tr' => '16',
         'plugin_id' => 'system_powered_by_block',
         'settings' => array('region' => 'footer', 'id' => 'powered'),
         'test_weight' => '0',
@@ -105,8 +103,8 @@ function testBlockAdminUiPage() {
     foreach ($this->blockValues as $delta => $values) {
       $block = $this->blocks[$delta];
       $label = $block->label();
-      $element = $this->xpath('//*[@id="blocks"]/tbody/tr[' . $values['tr'] . ']/td[1]/text()');
-      $this->assertTrue((string) $element[0] == $label, 'The "' . $label . '" block title is set inside the ' . $values['settings']['region'] . ' region.');
+      $element = $this->xpath('//select[@id="edit-blocks-' . $values['settings']['id'] . '-region"]/option[@selected]/@value');
+      $this->assertTrue((string) $element[0] == $values['settings']['region'], 'The "' . $label . '" block title is set inside the ' . $values['settings']['region'] . ' region.');
       // Look for a test block region select form element.
       $this->assertField('blocks[' . $values['settings']['id'] . '][region]', 'The block "' . $values['label'] . '" has a region assignment field.');
       // Move the test block to the header region.