Updated the test system

test/allEqual.test.js

@@ -0,0 +1,42 @@
+const expect = require('expect');
+const {allEqual} = require('./_30s.js');
+
+test('allEqual is a Function', () => {
+  expect(allEqual).toBeInstanceOf(Function);
+});
+
+test('Truthy numbers', () => {
+  expect(allEqual([4, 4, 4])).toBeTruthy();
+});
+
+test('Falsy numbers', () => {
+  expect(allEqual([4, 3.999, 4])).toBeFalsy();
+});
+
+test('Truthy strings', () => {
+  expect(allEqual(['lorem', 'lorem', 'lorem'])).toBeTruthy();
+});
+
+test('Falsy numbers', () => {
+  expect(allEqual(['lorem', 'ipsum', 'dolore'])).toBeFalsy();
+});
+
+test('Truthy trues', () => {
+  expect(allEqual([true, true, true])).toBeTruthy();
+});
+
+test('Truthy falses', () => {
+  expect(allEqual([false, false, false])).toBeTruthy();
+});
+
+test('Falsy trues', () => {
+  expect(allEqual([true, true, false])).toBeFalsy();
+});
+
+test('Falsy falses', () => {
+  expect(allEqual([false, false, true])).toBeFalsy();
+});
+
+test('False when there are different types', () => {
+  expect(allEqual([1, '1', true])).toBeFalsy();
+});