Updated the test system

test/isPrimitive.test.js

@@ -0,0 +1,42 @@
+const expect = require('expect');
+const {isPrimitive} = require('./_30s.js');
+
+test('isPrimitive is a Function', () => {
+  expect(isPrimitive).toBeInstanceOf(Function);
+});
+test('isPrimitive(null) is primitive', () => {
+  expect(isPrimitive(null)).toBeTruthy();
+});
+test('isPrimitive(undefined) is primitive', () => {
+  expect(isPrimitive(undefined)).toBeTruthy();
+});
+test('isPrimitive(string) is primitive', () => {
+  expect(isPrimitive('string')).toBeTruthy();
+});
+test('isPrimitive(true) is primitive', () => {
+  expect(isPrimitive(true)).toBeTruthy();
+});
+test('isPrimitive(50) is primitive', () => {
+  expect(isPrimitive(50)).toBeTruthy();
+});
+test("isPrimitive('Hello') is primitive", () => {
+  expect(isPrimitive('Hello')).toBeTruthy();
+});
+test('isPrimitive(false) is primitive', () => {
+  expect(isPrimitive(false)).toBeTruthy();
+});
+test('isPrimitive(Symbol()) is primitive', () => {
+  expect(isPrimitive(Symbol())).toBeTruthy();
+});
+test('isPrimitive([1, 2, 3]) is not primitive', () => {
+  expect(isPrimitive([1, 2, 3])).toBeFalsy();
+});
+test('isPrimitive({ a: 123 }) is not primitive', () => {
+  expect(isPrimitive({ a: 123 })).toBeFalsy();
+});
+let start = new Date().getTime();
+isPrimitive({ a: 123 });
+let end = new Date().getTime();
+test('isPrimitive({ a: 123 }) takes less than 2s to run', () => {
+  expect(end - start < 2000).toBeTruthy();
+});