Mocha 设置
npm install  ts-node  --save-dev
npm install chai mocha  @types/chai @types/mocha --save-dev
package.json 中添加
"scripts": {
    "test": "mocha test/**/*.test.js --parallel",
    "mocha": "mocha"
  }
Mocha Test Explorer
1 安装mocha插件 https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-mocha-test-adapter
https://github.com/hbenl/vscode-mocha-test-adapter
2 vscode 中settings.json设置
  "mocha.showInExplorer": true,
  "mochaExplorer.autoload": "onStart",
  "mochaExplorer.debuggerConfig": "",
  "mochaExplorer.files": "test/**/*.ts",
  "mochaExplorer.require": "ts-node/register"