Calling testWithSpectron() opens infinite windows

Describe the bug Calling testWithSpectron() hangs the tests, and starts opening as many Electron windows as it can until the tests time out.

To Reproduce Run the following spec:

import testWithSpectron from "vue-cli-plugin-electron-builder/lib/testWithSpectron";
import chai, { expect } from "chai";
import chaiAsPromised from "chai-as-promised";

chai.use(chaiAsPromised);

describe("Application launch", function() {
  this.timeout(30000);

  beforeEach(function() {
    console.log("Before Each -- testWithSpectron()");
    return testWithSpectron().then(instance => {
      console.log("testWithSpectron().then");
      this.app = instance.app;
      this.stopServe = instance.stopServe;
    });
  });

  beforeEach(function() {
    console.log("Before Each -- chaiAsPromised");
    chaiAsPromised.transferPromiseness = this.app.transferPromiseness;
  });

  afterEach(function() {
    console.log("After");
    if (this.app && this.app.isRunning()) {
      return this.stopServe();
    }
  });

  it("opens a window", function() {
    console.log("opens?");
    const gwc = this.app.client.getWindowCount();
    console.log(gwc);
    return expect(gwc).to.eventually.have.at.least(1);
  });
});

Expected behavior I expected the output

> Before Each -- testWithSpectron()
> testWithSpectron().then
> Before Each -- chaiAsPromised
> opens?
> After

And for it to only open one Electron window (or maybe even 0, if it should be headless).

Instead, it opens 5-10 windows (just keeps going until Mocha times out).

Screenshots

Environment (please complete the following information):

• OS and version: macOS 10.14.6 (18G87)
• node version: v12.5.0
• npm version: 6.9.0
• yarn version (if used): N/A
• vue-cli-plugin-electron-builder version : 1.4.0
• electron version: 6.0.7
• other vue plugins used:
  • @vue/cli-plugin-babel: 3.11.0
  • @vue/cli-plugin-eslint: 3.11.0
  • @vue/cli-plugin-unit-mocha: 3.11.0
  • @vue/cli-service: 3.11.0
  • @vue/test-utils: 1.0.0-beta.29
• custom config for vcp-electron-builder:

// vue.config.js
const path = require("path");

module.exports = {
  configureWebpack: {
    resolve: {
      alias: {
        Disciplines$: path.join(__dirname, "src/assets/earthdawn/disciplines"),
        Races$: path.join(__dirname, "src/assets/earthdawn/races"),
        Skills$: path.join(__dirname, "src/assets/earthdawn/skills"),
        Talents$: path.join(__dirname, "src/assets/earthdawn/talents"),
      },
    },
  },
  chainWebpack: config => {
    config.module
      .rule("yaml")
      .test(/\.ya?ml$/)
      .use("js-yaml-loader")
      .loader("js-yaml-loader")
      .end();
  },
  pluginOptions: {
    electronBuilder: {
      chainWebpackMainProcess: config => {
        config.resolve.alias.set("@", path.join(__dirname, "src/"));
      },
    },
  },
};

• (if possible) link to your repo: https://github.com/thislooksfun/earthdawn

Additional context N/A

[nklayman]

With the v2.0.0 beta, you pass the spectron module to the testWithSpectron function, so you can install the proper version of spectron to match your electron version.

[nklayman]

V2.0 of this plugin includes an upgrade to spectron. I will release it soon, but for now: yarn add -D vue-cli-plugin-electron-builder@alpha.