添加jest作为单元测试框架

README.md

@@ -3,11 +3,22 @@
 - npm compiler
 
   将TS编译成js
-  
+
 - npm run
 
   运行node程序
-  
+
 - npm dev
 
   运行node程序并且热更新
+
+### 参考资料
+- jest
+
+  https://jestjs.io/docs/en/getting-started
+
+- ts-jest
+
+  https://github.com/kulshekhar/ts-jest
+
+

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

package.json

@@ -3,12 +3,16 @@
   "version": "1.0.0",
   "scripts": {
     "compiler": "tsc --watch",
-    "run": "ts-node ./src/index.ts",
-    "dev": "ts-node-dev ./src/index.ts"
+    "run": "ts-node src/http.ts",
+    "dev": "ts-node-dev src/http.ts",
+    "test": "jest"
   },
   "dependencies": {},
   "devDependencies": {
+    "@types/jest": "^24.0.13",
     "@types/node": "^12.0.2",
+    "jest": "^24.8.0",
+    "ts-jest": "^24.0.2",
     "ts-node": "^8.1.0",
     "ts-node-dev": "^1.0.0-pre.39",
     "typescript": "^3.4.5"

src/index.ts → src/http.ts

@@ -1,10 +1,8 @@
 import {IncomingMessage, OutgoingMessage} from "http";
 
-const http = require("http")
+const http = require("http");
 
 http.createServer((req: IncomingMessage, res: OutgoingMessage) => {
-    res.write("hello world")
+    res.write("hello world");
     res.end()
-}).listen(8088)
-
-console.log("hello world")
+}).listen(8088);

src/math.ts

@@ -0,0 +1,11 @@
+export function add(a: number, b: number): number {
+    return a + b
+}
+
+export function minus(a: number, b: number): number {
+    return a - b
+}
+
+export function multi(a: number, b: number): number {
+    return a * b
+}

test/math.test.ts

@@ -0,0 +1,13 @@
+import {add, minus, multi} from '../src/math'
+
+test('adds 1 + 2 to equal 3', () => {
+  expect(add(1, 2)).toBe(3);
+});
+
+test('adds 1 - 2 to equal -1', () => {
+  expect(minus(1, 2)).toBe(-1);
+});
+
+test('adds 1 * 2 to equal 2', () => {
+  expect(multi(1, 2)).toBe(2);
+});