diff --git a/core/modules/locale/src/Tests/LocalePluralFormatTest.php b/core/modules/locale/src/Tests/LocalePluralFormatTest.php
index c0e9041..64af8cd 100644
--- a/core/modules/locale/src/Tests/LocalePluralFormatTest.php
+++ b/core/modules/locale/src/Tests/LocalePluralFormatTest.php
@@ -37,6 +37,18 @@ protected function setUp() {
   }
 
   /**
+   * Tests serialization of PluralTranslatableMarkup().
+   */
+  public function testPlurialTranslatableMarkupSerialization() {
+    // Tests with singular and plural values.
+    foreach ([1, 2] as $value) {
+      $markup = new PluralTranslatableMarkup($value, 'singular @count', 'plural @count');
+      $serialized_markup = unserialize(serialize($markup));
+      $this->assertIdentical($markup->render(), $serialized_markup->render());
+    }
+  }
+
+  /**
    * Tests locale_get_plural() and \Drupal::translation()->formatPlural()
    * functionality.
    */