Updated the test system

test/isObjectLike.test.js

@@ -0,0 +1,18 @@
+const expect = require('expect');
+const {isObjectLike} = require('./_30s.js');
+
+test('isObjectLike is a Function', () => {
+  expect(isObjectLike).toBeInstanceOf(Function);
+});
+test('Returns true for an object', () => {
+  expect(isObjectLike({})).toBeTruthy();
+});
+test('Returns true for an array', () => {
+  expect(isObjectLike([1, 2, 3])).toBeTruthy();
+});
+test('Returns false for a function', () => {
+  expect(isObjectLike(x => x)).toBeFalsy();
+});
+test('Returns false for null', () => {
+  expect(isObjectLike(null)).toBeFalsy();
+});