feat: jest get-started

src/2021-11/package.json

@@ -0,0 +1,15 @@
+{
+ "name": "2021-11",
+ "version": "1.0.0",
+ "description": "",
+ "main": "index.js",
+ "scripts": {
+ "test": "jest"
+ },
+ "keywords": [],
+ "author": "afeiship",
+ "license": "ISC",
+ "devDependencies": {
+ "jest": "^27.3.1"
+ }
+}

src/2021-11/sum.js

@@ -0,0 +1,5 @@
+function sum(a, b) {
+ return a + b;
+}
+
+module.exports = sum;

src/2021-11/sum.test.js

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+const sum = require('./sum');
+
+test('adds 1 + 2 to equal 3', () => {
+ expect(sum(1, 2)).toBe(3);
+});