Added some tests

test/debounce/debounce.js

@@ -0,0 +1,10 @@
+const debounce = (fn, wait = 0) => {
+let inDebounce;
+return function() {
+const context = this,
+args = arguments;
+clearTimeout(inDebounce);
+inDebounce = setTimeout(() => fn.apply(context, args), wait);
+};
+};
+module.exports = debounce