初始化项目，添加失败测试

Author: kenpusney

.gitignore

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+
+node_modules/

README.md

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+# TDD Dojo 环境预检查 - JS 版
+
+请完成本代码库的运行并修复失败的测试。
+
+## 环境要求
+
+必须：
+
+ - NodeJS 12 以上版本
+ - Yarn
+
+推荐：
+
+ - WebStorm 或者 Visual Studio Code 最新版
+
+## 运行方式
+
+ - 安装依赖 `yarn`
+ - 运行测试 `yarn test`

babel.config.js

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+module.exports = {
+    presets: [
+      [
+        '@babel/preset-env',
+        {
+          targets: {
+            node: 'current',
+          },
+        },
+      ],
+    ],
+  };
+  

package.json

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+{
+  "name": "dojo",
+  "version": "1.0.0",
+  "description": "TDD dojo by extremeprogramming.cn",
+  "main": "src/index.js",
+  "author": "Kimmy",
+  "license": "MIT",
+  "scripts": {
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.7.5",
+    "@babel/preset-env": "^7.7.6",
+    "babel-jest": "^24.9.0",
+    "jest": "^24.9.0"
+  }
+}

src/Calculator.js

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+
+export default class Calculator {
+    add(x, y) {
+        return 0;
+    }
+}

src/Calculator.test.js

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+
+import Calculator from "./Calculator"
+
+describe("Calculator", () => {
+    it("should equal to 2 when add 1 and 1", () => {
+        const calculator = new Calculator()
+
+        const result = calculator.add(1, 1)
+
+        expect(result).toBe(2)
+    })
+});