Updated the test system

test/objectToPairs.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {objectToPairs} = require('./_30s.js');
+
+test('objectToPairs is a Function', () => {
+  expect(objectToPairs).toBeInstanceOf(Function);
+});
+test('Creates an array of key-value pair arrays from an object.', () => {
+  expect(objectToPairs({ a: 1, b: 2 })).toEqual([['a', 1], ['b', 2]]);
+});