Let you run unit tests with breakpoints in vscode, using vue-cli-service

launch.json

{
  {
      "type": "node",
      "request": "launch",
      "name": "vue-cli-service test:unit (by open package.json)",
      "runtimeExecutable": "node",
      "autoAttachChildProcesses": false,
      "cwd": "${fileDirname}",
      "args": [
        "${fileDirname}/vue-cli-service-debug-bin.js",
        "--inspect",
        "${fileDirname}/node_modules/@vue/cli-service/bin/vue-cli-service.js",
        "test:unit",
        "--runInBand",
        "--no-cache",
        "--watch"
      ],
      "internalConsoleOptions": "neverOpen",
      "console": "integratedTerminal"
    }
}

vue-cli-service-debug-bin.js

const fs = require("fs");
const { spawn } = require("child_process");
const path = require("path");

// we want to use this silly export statement without using shell
// because vscode debugger doesn't attach too well to the shell
let exportStatement = /export NODE_PATH="(.*)"/.exec(
  fs.readFileSync(path.join(__dirname, "node_modules/.bin/vue-cli-service"))
)[1];

spawn(
  "node",
  process.argv.slice(2),
  {
    env: {
      ...process.env,
      NODE_PATH: exportStatement + ":" + process.env.NODE_PATH
    },
    cwd: __dirname,
    stdio: "inherit",
  }
);