setup mocha and chai

install.bat

$ npm install mocha chai ts-node -g
$ npm install --save-dev mocha chai ts-node @types/chai @types/mocha


Article: https://medium.com/@FizzyInTheHall/run-typescript-mocha-tests-in-visual-studio-code-58e62a173575

launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
          "type": "node",
          "request": "launch",
          "name": "Mocha Tests",
          "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
          "args": [
            "--require",
            "ts-node/register",
            "-u",
            "tdd",
            "--timeout",
            "999999",
            "--colors",
            "--recursive",
            "${workspaceFolder}/test/**/*.ts"
          ],
          "internalConsoleOptions": "openOnSessionStart"
        }
      ]
}

package.json

"scripts": {
    "test": "mocha --require ts-node/register test/**/*.ts"
}

tsconfig.json

{
    "compilerOptions": {
      "outDir": "tmp",
      "target": "es5",
      "module": "commonjs",
      "lib": [
        "es2017",
        "dom"
      ],
      "rootDir": "src",
      "jsx": "react",
      "sourceMap": true,
      "declaration": true,
      "moduleResolution": "node",
      "noImplicitAny": false,
      "removeComments": true,
      "experimentalDecorators": true,
      "skipLibCheck": true,
      "types": [
        "mocha",
        "node"
      ],
  
    },
    "exclude": [
      "node_modules",
      "webpack.config.js",
      "gulpfile.js",
      "build",
      "dist",
      "tmp",
      "acceptance-tests",
      "webpack",
      "jest",
    ]
  }
  

Article https://medium.com/@FizzyInTheHall/run-typescript-mocha-tests-in-visual-studio-code-58e62a173575