WIP DB/PreparedSQLPlaceholders: add namespaced tests

Need to complete the list of tests

Author: rodrigoprimo

WordPress/Tests/DB/PreparedSQLPlaceholdersUnitTest.inc

@@ -80,7 +80,7 @@ $where = $wpdb->prepare(
 ); // OK.
 
 $where = $wpdb->prepare(
-	sprintf(
+	\sprintf(
 		"{$wpdb->posts}.post_type IN (%s)
 		AND {$wpdb->posts}.post_status IN (%s)",
 		implode( ',', array_fill( 0, count($post_types), '%s' ), ),
@@ -518,3 +518,16 @@ $where = $wpdb->prepare(
  */
 $callback = $wpdb->prepare(...); // OK.
 
+/*
+ * Safeguard correct handling of namespaced function calls.
+ */
+//$sql = MyNamespace\WPDB::prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s" );
+//$sql = \MyNamespace\WPDB::prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s" );
+//$sql = namespace\WPDB::prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s" ); // The sniff should start flagging this once it can resolve relative namespaces.
+//$where = $wpdb->prepare(
+//    MyNamespace\sprintf(
+//        "{$wpdb->posts}.post_type IN (%s)",
+//        MyNamespace\implode( ',', MyNamespace\array_fill( 0, count($post_types), '%s' ) )
+//    ),
+//    $post_types
+//);