diff --git a/core/modules/telephone/src/Tests/TelephoneFieldTest.php b/core/modules/telephone/src/Tests/TelephoneFieldTest.php
index f7452b0..a8f7d91 100644
--- a/core/modules/telephone/src/Tests/TelephoneFieldTest.php
+++ b/core/modules/telephone/src/Tests/TelephoneFieldTest.php
@@ -44,7 +44,7 @@ protected function setUp() {
   /**
    * Helper function for testTelephoneField().
    */
-  function testTelephoneField() {
+  public function testTelephoneField() {
 
     // Add the telephone field to the article content type.
     FieldStorageConfig::create(array(
@@ -97,6 +97,15 @@ function testTelephoneField() {
 
     $this->drupalPostForm('node/add/article', $edit, t('Save'));
     $this->assertRaw('<a href="tel:123456789">', 'Telephone link is output with whitespace removed.');
+
+    // Add number with 5 or less digitals.
+    $edit = array(
+        'title[0][value]' => $this->randomMachineName(),
+        'field_telephone[0][value]' => "911",
+    );
+
+    $this->drupalPostForm('node/add/article', $edit, t('Save'));
+    $this->assertRaw('<a href="tel:911">', 'Telephone link for number with 5 or less digitals.');
   }
 
 }