[addon] check rd cached torrents in chunks

addon/moch/mochHelper.js

@@ -0,0 +1,7 @@
+function chunkArray(arr, size) {
+  return arr.length > size
+      ? [arr.slice(0, size), ...chunkArray(arr.slice(size), size)]
+      : [arr];
+}
+
+module.exports = { chunkArray }