diff --git a/core/modules/telephone/src/Tests/TelephoneFieldTest.php b/core/modules/telephone/src/Tests/TelephoneFieldTest.php
index 515d7e0..3043e42 100644
--- a/core/modules/telephone/src/Tests/TelephoneFieldTest.php
+++ b/core/modules/telephone/src/Tests/TelephoneFieldTest.php
@@ -100,5 +100,23 @@ function testTelephoneField() {
 
     $this->drupalPostForm('node/add/article', $edit, t('Save'));
     $this->assertRaw('<a href="tel:123456789">', 'Telephone link is output with whitespace removed.');
+
+    // Add a number with a plus, dashes and parentheses.
+    $edit = array(
+      'title[0][value]' => $this->randomMachineName(),
+      'field_telephone[0][value]' => '+49-(89)-1234567',
+    );
+
+    $this->drupalPostForm('node/add/article', $edit, t('Save'));
+    $this->assertRaw('<a href="tel:49891234567">', 'Telephone link is output with plus, dashes and parentheses removed.');
+
+    // Add a number with a slash and points.
+    $edit = array(
+      'title[0][value]' => $this->randomMachineName(),
+      'field_telephone[0][value]' => '012/34.56.78',
+    );
+
+    $this->drupalPostForm('node/add/article', $edit, t('Save'));
+    $this->assertRaw('<a href="tel:012345678">', 'Telephone link is output with slash and points removed.');
   }
 }