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diff --git a/web/core/modules/field/tests/modules/field_test/src/Plugin/Field/FieldFormatter/TestFieldEmptyFormatter.php b/web/core/modules/field/tests/modules/field_test/src/Plugin/Field/FieldFormatter/TestFieldEmptyFormatter.php
new file mode 100644
index 000000000..c8072177f
--- /dev/null
+++ b/web/core/modules/field/tests/modules/field_test/src/Plugin/Field/FieldFormatter/TestFieldEmptyFormatter.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Drupal\field_test\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\FormatterBase;
+
+/**
+ * Plugin implementation of the 'field_empty_test' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "field_empty_test",
+ *   label = @Translation("Field empty test"),
+ *   field_types = {
+ *     "test_field",
+ *   },
+ *   weight = -5
+ * )
+ */
+class TestFieldEmptyFormatter extends FormatterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return [
+      'test_empty_string' => '**EMPTY FIELD**',
+    ] + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items, $langcode) {
+    $elements = [];
+
+    if ($items->isEmpty()) {
+      // For fields with no value, just add the configured "empty" value.
+      $elements[0] = ['#markup' => $this->getSetting('test_empty_string')];
+    }
+    else {
+      foreach ($items as $delta => $item) {
+        // This formatter only needs to output raw for testing.
+        $elements[$delta] = ['#markup' => $item->value];
+      }
+    }
+
+    return $elements;
+  }
+
+}