generate new test that did already exist & update all module snippets with declaration

test/indexOfAll/indexOfAll.js

@@ -1,4 +1,4 @@
-module.exports = (arr, val) => {
+module.exports = indexOfAll = (arr, val) => {
 const indices = [];
 arr.forEach((el, i) => el === val && indices.push(i));
 return indices;