Index: tests/phpunit/tests/functions.php
===================================================================
--- tests/phpunit/tests/functions.php	(revision 43311)
+++ tests/phpunit/tests/functions.php	(working copy)
@@ -559,6 +559,7 @@
 	function data_wp_parse_id_list() {
 		return array(
 			array( array( 1, 2, 3, 4 ), '1,2,3,4' ),
+			array( array( 0, 1, 2, 3, 4 ), ' 1,2,3,4' ),
 			array( array( 1, 2, 3, 4 ), '1, 2,,3,4' ),
 			array( array( 1, 2, 3, 4 ), '1,2,2,3,4' ),
 			array( array( 1, 2, 3, 4 ), array( '1', '2', '3', '4', '3' ) ),
@@ -578,6 +579,7 @@
 	function data_wp_parse_slug_list() {
 		return array(
 			array( array( 'apple', 'banana', 'carrot', 'dog' ), 'apple,banana,carrot,dog' ),
+			array( array( '', 'apple', 'banana', 'carrot', 'dog' ), ' apple,banana,carrot,dog' ),
 			array( array( 'apple', 'banana', 'carrot', 'dog' ), 'apple, banana,,carrot,dog' ),
 			array( array( 'apple', 'banana', 'carrot', 'dog' ), 'apple banana carrot dog' ),
 			array( array( 'apple', 'banana-carrot', 'd-o-g' ), array( 'apple ', 'banana carrot', 'd o g' ) ),