Updated the test system

test/quickSort.test.js

@@ -0,0 +1,43 @@
+const expect = require('expect');
+const {quickSort} = require('./_30s.js');
+
+test('quickSort is a Function', () => {
+  expect(quickSort).toBeInstanceOf(Function);
+});
+test('quickSort([5, 6, 4, 3, 1, 2]) returns [1, 2, 3, 4, 5, 6]', () => {
+  expect(quickSort([5, 6, 4, 3, 1, 2])).toEqual([1, 2, 3, 4, 5, 6]);
+});
+test('quickSort([-1, 0, -2]) returns [-2, -1, 0]', () => {
+  expect(quickSort([-1, 0, -2])).toEqual([-2, -1, 0]);
+});
+test('quickSort() throws an error', () => {
+  expect(() => {
+    quickSort();
+  }).toThrow();
+});
+test('quickSort(123) throws an error', () => {
+  expect(() => {
+    quickSort(123);
+  }).toThrow();
+});
+test('quickSort({ 234: string}) throws an error', () => {
+  expect(() => {
+    quickSort({ 234: string });
+  }).toThrow();
+});
+test('quickSort(null) throws an error', () => {
+  expect(() => {
+    quickSort(null);
+  }).toThrow();
+});
+test('quickSort(undefined) throws an error', () => {
+  expect(() => {
+    quickSort(undefined);
+  }).toThrow();
+});
+let start = new Date().getTime();
+quickSort([11, 1, 324, 23232, -1, 53, 2, 524, 32, 13, 156, 133, 62, 12, 4]);
+let end = new Date().getTime();
+test('quickSort([11, 1, 324, 23232, -1, 53, 2, 524, 32, 13, 156, 133, 62, 12, 4]) takes less than 2s to run', () => {
+  expect(end - start < 2000).toBeTruthy();
+});