diff --git a/core/modules/system/src/Tests/Update/UpdatePostUpdateTest.php b/core/modules/system/src/Tests/Update/UpdatePostUpdateTest.php
index 67b2ba2..85f3247 100644
--- a/core/modules/system/src/Tests/Update/UpdatePostUpdateTest.php
+++ b/core/modules/system/src/Tests/Update/UpdatePostUpdateTest.php
@@ -7,6 +7,8 @@
 
 namespace Drupal\system\Tests\Update;
 
+use Drupal\Component\Render\FormattableMarkup;
+
 /**
  * Tests hook_post_update().
  *
@@ -32,7 +34,7 @@ protected function doSelectionTest() {
 
     // Ensure that normal and post_update updates are merged together on the
     // selection page.
-    $this->assertRaw('<ul><li>8001 -   Normal update_N() function. </li><li>First update.</li><li>Second update.</li><li>Test1 update.</li><li>Test0 update.</li></ul>');
+    $this->assertRaw('<ul><li>8001 -   Normal update_N() function. </li><li>First update.</li><li>Second update.</li><li>Test1 update.</li><li>Test0 update.</li><li>Testing batch processing in post updates update.</li></ul>');
   }
 
   /**
@@ -49,24 +51,34 @@ public function testPostUpdate() {
     $this->assertRaw('Test1 update');
     $this->assertRaw('<h3>Update test0</h3>');
     $this->assertRaw('Test0 update');
+    $this->assertRaw('<h3>Update test_batch</h3>');
+    $this->assertRaw('Test post update batches');
 
+    // Test state value set by each post update.
     $updates = [
       'update_test_postupdate_post_update_first',
       'update_test_postupdate_post_update_second',
       'update_test_postupdate_post_update_test1',
       'update_test_postupdate_post_update_test0',
+      'update_test_postupdate_post_update_test_batch-1',
+      'update_test_postupdate_post_update_test_batch-2',
+      'update_test_postupdate_post_update_test_batch-3',
     ];
     $this->assertIdentical($updates, \Drupal::state()->get('post_update_test_execution', []));
 
-    $key_value = \Drupal::keyValue('post_update');
-    $updates = array_merge([
-      'block_post_update_disable_blocks_with_missing_contexts',
-      'field_post_update_save_custom_storage_property',
-      'field_post_update_entity_reference_handler_setting',
-      'system_post_update_recalculate_configuration_entity_dependencies',
-      'views_post_update_update_cacheability_metadata',
-    ], $updates);
-    $this->assertEqual($updates, $key_value->get('existing_updates'));
+    // Test post_update key value stores contains a list of the update functions
+    // that have run.
+    $existing_updates = array_count_values(\Drupal::keyValue('post_update')->get('existing_updates'));
+    $expected_updates = [
+      'update_test_postupdate_post_update_first',
+      'update_test_postupdate_post_update_second',
+      'update_test_postupdate_post_update_test1',
+      'update_test_postupdate_post_update_test0',
+      'update_test_postupdate_post_update_test_batch',
+    ];
+    foreach ($expected_updates as $expected_update) {
+      $this->assertEqual($existing_updates[$expected_update], 1, new FormattableMarkup("@expected_update exists in 'existing_updates' key and only appears once.", ['@expected_update' => $expected_update]));
+    }
 
     $this->drupalGet('update.php/selection');
     $this->assertText('No pending updates.');
diff --git a/core/modules/system/tests/modules/update_test_postupdate/update_test_postupdate.post_update.php b/core/modules/system/tests/modules/update_test_postupdate/update_test_postupdate.post_update.php
index e914cac..ece8b7e 100644
--- a/core/modules/system/tests/modules/update_test_postupdate/update_test_postupdate.post_update.php
+++ b/core/modules/system/tests/modules/update_test_postupdate/update_test_postupdate.post_update.php
@@ -43,3 +43,22 @@ function update_test_postupdate_post_update_test0() {
 
   return 'Test0 update';
 }
+
+/**
+ * Testing batch processing in post updates update.
+ */
+function update_test_postupdate_post_update_test_batch(&$sandbox = NULL) {
+  if (!isset($sandbox['steps'])) {
+    $sandbox['current_step'] = 0;
+    $sandbox['steps'] = 3;
+  }
+
+  $sandbox['current_step']++;
+
+  $execution = \Drupal::state()->get('post_update_test_execution', []);
+  $execution[] = __FUNCTION__ . '-' . $sandbox['current_step'];
+  \Drupal::state()->set('post_update_test_execution', $execution);
+
+  $sandbox['#finished'] = $sandbox['current_step'] /  $sandbox['steps'];
+  return 'Test post update batches';
+}