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diff --git a/web/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php b/web/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php
new file mode 100644
index 000000000..b09eb58c0
--- /dev/null
+++ b/web/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace Drupal\Tests\field\Kernel\String;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
+use Drupal\Core\Entity\FieldableEntityInterface;
+use Drupal\entity_test\Entity\EntityTestRev;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the creation of text fields.
+ *
+ * @group field
+ */
+class StringFormatterTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['field', 'text', 'entity_test', 'system', 'filter', 'user'];
+
+  /**
+   * @var string
+   */
+  protected $entityType;
+
+  /**
+   * @var string
+   */
+  protected $bundle;
+
+  /**
+   * @var string
+   */
+  protected $fieldName;
+
+  /**
+   * @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface
+   */
+  protected $display;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Configure the theme system.
+    $this->installConfig(['system', 'field']);
+    \Drupal::service('router.builder')->rebuild();
+    $this->installEntitySchema('entity_test_rev');
+
+    $this->entityType = 'entity_test_rev';
+    $this->bundle = $this->entityType;
+    $this->fieldName = Unicode::strtolower($this->randomMachineName());
+
+    $field_storage = FieldStorageConfig::create([
+      'field_name' => $this->fieldName,
+      'entity_type' => $this->entityType,
+      'type' => 'string',
+    ]);
+    $field_storage->save();
+
+    $instance = FieldConfig::create([
+      'field_storage' => $field_storage,
+      'bundle' => $this->bundle,
+      'label' => $this->randomMachineName(),
+    ]);
+    $instance->save();
+
+    $this->display = entity_get_display($this->entityType, $this->bundle, 'default')
+      ->setComponent($this->fieldName, [
+        'type' => 'string',
+        'settings' => [],
+      ]);
+    $this->display->save();
+  }
+
+  /**
+   * Renders fields of a given entity with a given display.
+   *
+   * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
+   *   The entity object with attached fields to render.
+   * @param \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display
+   *   The display to render the fields in.
+   *
+   * @return string
+   *   The rendered entity fields.
+   */
+  protected function renderEntityFields(FieldableEntityInterface $entity, EntityViewDisplayInterface $display) {
+    $content = $display->build($entity);
+    $content = $this->render($content);
+    return $content;
+  }
+
+  /**
+   * Tests string formatter output.
+   */
+  public function testStringFormatter() {
+    $value = $this->randomString();
+    $value .= "\n\n<strong>" . $this->randomString() . '</strong>';
+    $value .= "\n\n" . $this->randomString();
+
+    $entity = EntityTestRev::create([]);
+    $entity->{$this->fieldName}->value = $value;
+
+    // Verify that all HTML is escaped and newlines are retained.
+    $this->renderEntityFields($entity, $this->display);
+    $this->assertNoRaw($value);
+    $this->assertRaw(nl2br(Html::escape($value)));
+
+    // Verify the cache tags.
+    $build = $entity->{$this->fieldName}->view();
+    $this->assertTrue(!isset($build[0]['#cache']), 'The string formatter has no cache tags.');
+
+    $value = $this->randomMachineName();
+    $entity->{$this->fieldName}->value = $value;
+    $entity->save();
+
+    // Set the formatter to link to the entity.
+    $this->display->setComponent($this->fieldName, [
+      'type' => 'string',
+      'settings' => [
+        'link_to_entity' => TRUE,
+      ],
+    ]);
+    $this->display->save();
+
+    $this->renderEntityFields($entity, $this->display);
+    $this->assertLink($value, 0);
+    $this->assertLinkByHref($entity->url());
+
+    // $entity->url('revision') falls back to the canonical URL if this is no
+    // revision.
+    $this->assertLinkByHref($entity->url('revision'));
+
+    // Make the entity a new revision.
+    $old_revision_id = $entity->getRevisionId();
+    $entity->setNewRevision(TRUE);
+    $value2 = $this->randomMachineName();
+    $entity->{$this->fieldName}->value = $value2;
+    $entity->save();
+    $entity_new_revision = \Drupal::entityManager()->getStorage('entity_test_rev')->loadRevision($old_revision_id);
+
+    $this->renderEntityFields($entity, $this->display);
+    $this->assertLink($value2, 0);
+    $this->assertLinkByHref($entity->url('revision'));
+
+    $this->renderEntityFields($entity_new_revision, $this->display);
+    $this->assertLink($value, 0);
+    $this->assertLinkByHref('/entity_test_rev/' . $entity_new_revision->id() . '/revision/' . $entity_new_revision->getRevisionId() . '/view');
+  }
+
+}