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

test/binarySearch/binarySearch.js

@@ -1,4 +1,4 @@
-module.exports = (arr, val, start = 0, end = arr.length - 1) => {
+module.exports = binarySearch = (arr, val, start = 0, end = arr.length - 1) => {
 if (start > end) return -1;
 const mid = Math.floor((start + end) / 2);
 if (arr[mid] > val) return binarySearch(arr, val, start, mid - 1);