diff --git a/core/modules/user/tests/src/FunctionalJavascript/UserPasswordResetTest.php b/core/modules/user/tests/src/FunctionalJavascript/UserPasswordResetTest.php
index 5d996c0298edb45cd157296b4914762cff7951ec..061f8cf4011423fa28dd56fc26d633066fa43cb4 100644
--- a/core/modules/user/tests/src/FunctionalJavascript/UserPasswordResetTest.php
+++ b/core/modules/user/tests/src/FunctionalJavascript/UserPasswordResetTest.php
@@ -84,6 +84,9 @@ public function testUserPasswordResetWithAdditionalAjaxForm(): void {
     $edit['name'] = $this->account->getAccountName();
     $this->submitForm($edit, 'Submit');
 
+    // Check that the email message body does not contain HTML entities
+    $this->assertTrue($this->checkBodyText(), 'The body text of the email contains no HTML entities');
+
     $resetURL = $this->getResetURL();
     $this->drupalGet($resetURL);
 
@@ -122,4 +125,17 @@ public function getResetURL() {
     return $urls[0];
   }
 
+  /**
+   * Checks the email body text for the presence of HTML entities.
+   */
+  public function checkBodyText(): bool {
+    // Assume the most recent email.
+    $_emails = $this->drupalGetMails();
+    $email = end($_emails);
+    if (strip_tags($email['body']) === $email['body']) {
+      return TRUE;
+    }
+    return FALSE;
+  }
+
 }