Updated the test system

test/uniqueElements.test.js

@@ -0,0 +1,61 @@
+const expect = require('expect');
+const {uniqueElements} = require('./_30s.js');
+
+test('uniqueElements is a Function', () => {
+  expect(uniqueElements).toBeInstanceOf(Function);
+});
+test('uniqueElements([1, 2, 2, 3, 4, 4, 5]) returns [1,2,3,4,5]', () => {
+  expect(uniqueElements([1, 2, 2, 3, 4, 4, 5])).toEqual([1, 2, 3, 4, 5]);
+});
+test('uniqueElements([1, 23, 53]) returns [1, 23, 53]', () => {
+  expect(uniqueElements([1, 23, 53])).toEqual([1, 23, 53]);
+});
+test("uniqueElements([true, 0, 1, false, false, undefined, null, '']) returns [true, 0, 1, false, false, undefined, null, '']", () => {
+  expect(uniqueElements([true, 0, 1, false, false, undefined, null, ''])).toEqual([
+    true,
+    0,
+    1,
+    false,
+    undefined,
+    null,
+    ''
+  ]);
+});
+test('uniqueElements() returns []', () => {
+  expect(uniqueElements()).toEqual([]);
+});
+test('uniqueElements(null) returns []', () => {
+  expect(uniqueElements(null)).toEqual([]);
+});
+test('uniqueElements(undefined) returns []', () => {
+  expect(uniqueElements(undefined)).toEqual([]);
+});
+test("uniqueElements('strt') returns ['s', 't', 'r']", () => {
+  expect(uniqueElements('strt')).toEqual(['s', 't', 'r']);
+});
+test('uniqueElements(1, 1, 2543, 534, 5) throws an error', () => {
+  expect(() => {
+    uniqueElements(1, 1, 2543, 534, 5);
+  }).toThrow();
+});
+test('uniqueElements({}) throws an error', () => {
+  expect(() => {
+    uniqueElements({});
+  }).toThrow();
+});
+test('uniqueElements(true) throws an error', () => {
+  expect(() => {
+    uniqueElements(true);
+  }).toThrow();
+});
+test('uniqueElements(false) throws an error', () => {
+  expect(() => {
+    uniqueElements(false);
+  }).toThrow();
+});
+let start = new Date().getTime();
+uniqueElements([true, 0, 1, false, false, undefined, null, '']);
+let end = new Date().getTime();
+test('uniqueElements([true, 0, 1, false, false, undefined, null]) takes less than 2s to run', () => {
+  expect(end - start < 2000).toBeTruthy();
+});