Test cleanup and fixes [a-b]

test/debounce/debounce.test.js

@@ -5,6 +5,6 @@ const debounce = require('./debounce.js');
   test('debounce is a Function', () => {
   expect(debounce).toBeInstanceOf(Function);
 });
-  debounce(() => {t.pass('Works as expected');}, 250);
+  debounce(() => {