Updated the test system

test/times.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const {times} = require('./_30s.js');
+
+test('times is a Function', () => {
+  expect(times).toBeInstanceOf(Function);
+});
+var output = '';
+times(5, i => (output += i));
+test('Runs a function the specified amount of times', () => {
+  expect(output).toBe('01234');
+});