Add tewst for zero string.

Author: peterwilsoncc

tests/phpunit/tests/dependencies/scripts.php

@@ -4199,6 +4199,10 @@ public function data_varying_versions_handle_args() {
 				'',
 				"ver={$default_version}&qs1=q1&qs2=q2",
 			),
+			'zero-string'  => array(
+				'0',
+				"ver={$default_version}&qs1=q1&qs2=q2",
+			),
 			'integer'      => array(
 				123,
 				'ver=123&qs1=q1&qs2=q2',

tests/phpunit/tests/dependencies/styles.php

@@ -921,6 +921,10 @@ public function data_varying_versions_handle_args() {
 				'',
 				"ver={$default_version}&qs1=q1&qs2=q2",
 			),
+			'zero-string'  => array(
+				'0',
+				"ver={$default_version}&qs1=q1&qs2=q2",
+			),
 			'integer'      => array(
 				123,
 				'ver=123&qs1=q1&qs2=q2',