diff --git a/core/modules/telephone/lib/Drupal/telephone/Tests/TelephoneFieldTest.php b/core/modules/telephone/lib/Drupal/telephone/Tests/TelephoneFieldTest.php
index 6158f07..8fb2661 100644
--- a/core/modules/telephone/lib/Drupal/telephone/Tests/TelephoneFieldTest.php
+++ b/core/modules/telephone/lib/Drupal/telephone/Tests/TelephoneFieldTest.php
@@ -53,10 +53,11 @@ function setUp() {
   function testTelephoneField() {
 
     // Add the telepone field to the article content type.
-    entity_create('field_entity', array(
+    $field = entity_create('field_entity', array(
       'field_name' => 'field_telephone',
       'type' => 'telephone',
-    ))->save();
+    ));
+    $field->save();
     entity_create('field_instance', array(
       'field_name' => 'field_telephone',
       'label' => 'Telephone Number',
@@ -102,5 +103,17 @@ function testTelephoneField() {
 
     $this->drupalPost('node/add/article', $edit, t('Save'));
     $this->assertRaw('<a href="tel:123456789">', 'Telephone link is output with whitespace removed.');
+
+    // Test that module can't be disabled while its fields exists.
+    $admin_user = $this->drupalCreateUser(array('access administration pages', 'administer modules'));
+    $this->drupalLogin($admin_user);
+    $this->drupalGet('admin/modules');
+    $this->assertText('Fields type(s) in use');
+    $field->delete();
+    $this->drupalGet('admin/modules');
+    $this->assertText('Fields pending deletion');
+    $this->cronRun();
+    $this->assertNoText('Fields pending deletion');
   }
+
 }