Updated the test system

test/isEmpty.test.js

@@ -0,0 +1,36 @@
+const expect = require('expect');
+const {isEmpty} = require('./_30s.js');
+
+test('isEmpty is a Function', () => {
+  expect(isEmpty).toBeInstanceOf(Function);
+});
+test('Returns true for empty Map', () => {
+  expect(isEmpty(new Map())).toBeTruthy();
+});
+test('Returns true for empty Set', () => {
+  expect(isEmpty(new Set())).toBeTruthy();
+});
+test('Returns true for empty array', () => {
+  expect(isEmpty([])).toBeTruthy();
+});
+test('Returns true for empty object', () => {
+  expect(isEmpty({})).toBeTruthy();
+});
+test('Returns true for empty string', () => {
+  expect(isEmpty('')).toBeTruthy();
+});
+test('Returns false for non-empty array', () => {
+  expect(isEmpty([1, 2])).toBeFalsy();
+});
+test('Returns false for non-empty object', () => {
+  expect(isEmpty({ a: 1, b: 2 })).toBeFalsy();
+});
+test('Returns false for non-empty string', () => {
+  expect(isEmpty('text')).toBeFalsy();
+});
+test('Returns true - type is not considered a collection', () => {
+  expect(isEmpty(123)).toBeTruthy();
+});
+test('Returns true - type is not considered a collection', () => {
+  expect(isEmpty(true)).toBeTruthy();
+});