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diff --git a/web/core/modules/system/tests/src/Functional/Form/FormStoragePageCacheTest.php b/web/core/modules/system/tests/src/Functional/Form/FormStoragePageCacheTest.php
new file mode 100644
index 000000000..474a35b55
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Form/FormStoragePageCacheTest.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Form;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests form storage from cached pages.
+ *
+ * @group Form
+ */
+class FormStoragePageCacheTest extends BrowserTestBase {
+
+  /**
+   * @var array
+   */
+  public static $modules = ['form_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $config = $this->config('system.performance');
+    $config->set('cache.page.max_age', 300);
+    $config->save();
+  }
+
+  /**
+   * Return the build id of the current form.
+   */
+  protected function getFormBuildId() {
+    $build_id_fields = $this->xpath('//input[@name="form_build_id"]');
+    $this->assertEqual(count($build_id_fields), 1, 'One form build id field on the page');
+    return (string) $build_id_fields[0]->getAttribute('value');
+  }
+
+  /**
+   * Build-id is regenerated when validating cached form.
+   */
+  public function testValidateFormStorageOnCachedPage() {
+    $this->drupalGet('form-test/form-storage-page-cache');
+    $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_initial = $this->getFormBuildId();
+
+    // Trigger validation error by submitting an empty title.
+    $edit = ['title' => ''];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_first_validation = $this->getFormBuildId();
+    $this->assertNotEqual($build_id_initial, $build_id_first_validation, 'Build id changes when form validation fails');
+
+    // Trigger validation error by again submitting an empty title.
+    $edit = ['title' => ''];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_second_validation = $this->getFormBuildId();
+    $this->assertEqual($build_id_first_validation, $build_id_second_validation, 'Build id remains the same when form validation fails subsequently');
+
+    // Repeat the test sequence but this time with a page loaded from the cache.
+    $this->drupalGet('form-test/form-storage-page-cache');
+    $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_from_cache_initial = $this->getFormBuildId();
+    $this->assertEqual($build_id_initial, $build_id_from_cache_initial, 'Build id is the same as on the first request');
+
+    // Trigger validation error by submitting an empty title.
+    $edit = ['title' => ''];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_from_cache_first_validation = $this->getFormBuildId();
+    $this->assertNotEqual($build_id_initial, $build_id_from_cache_first_validation, 'Build id changes when form validation fails');
+    $this->assertNotEqual($build_id_first_validation, $build_id_from_cache_first_validation, 'Build id from first user is not reused');
+
+    // Trigger validation error by again submitting an empty title.
+    $edit = ['title' => ''];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_from_cache_second_validation = $this->getFormBuildId();
+    $this->assertEqual($build_id_from_cache_first_validation, $build_id_from_cache_second_validation, 'Build id remains the same when form validation fails subsequently');
+  }
+
+  /**
+   * Build-id is regenerated when rebuilding cached form.
+   */
+  public function testRebuildFormStorageOnCachedPage() {
+    $this->drupalGet('form-test/form-storage-page-cache');
+    $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');
+    $this->assertText('No old build id', 'No old build id on the page');
+    $build_id_initial = $this->getFormBuildId();
+
+    // Trigger rebuild, should regenerate build id. When a submit handler
+    // triggers a rebuild, the form is built twice in the same POST request,
+    // and during the second build, there is an old build ID, but because the
+    // form is not cached during the initial GET request, it is different from
+    // that initial build ID.
+    $edit = ['title' => 'something'];
+    $this->drupalPostForm(NULL, $edit, 'Rebuild');
+    $this->assertNoText('No old build id', 'There is no old build id on the page.');
+    $this->assertNoText($build_id_initial, 'The old build id is not the initial build id.');
+    $build_id_first_rebuild = $this->getFormBuildId();
+    $this->assertNotEqual($build_id_initial, $build_id_first_rebuild, 'Build id changes on first rebuild.');
+
+    // Trigger subsequent rebuild, should regenerate the build id again.
+    $edit = ['title' => 'something'];
+    $this->drupalPostForm(NULL, $edit, 'Rebuild');
+    $this->assertText($build_id_first_rebuild, 'First build id as old build id on the page');
+    $build_id_second_rebuild = $this->getFormBuildId();
+    $this->assertNotEqual($build_id_first_rebuild, $build_id_second_rebuild, 'Build id changes on second rebuild.');
+  }
+
+}