spectron: Error: ChromeDriver did not start within 5000ms

I’m trying to run the getting started script from here (slightly modified).

const Application = require("spectron").Application;
const path = require("path");
const assert = require("assert");

const electronPath = require("electron");
const appPath = path.join(__dirname, "..");

const app = new Application({
  path: electronPath,
  args: [appPath]
});

describe("application launch", function () {
  this.timeout(15000);

  beforeEach(function () {
    return app.start();
  });

  afterEach(function () {
    if (app && app.isRunning()) {
      return app.stop();
    }
  });

  it("shows an initial window", function () {
    return app.client.getWindowCount().then(function (count) {
      assert.equal(count, 1);
    });
  });
});

I’ve tried to run this script but I’m getting following error

bash-3.2$ ./node_modules/.bin/mocha ./test/main.js 


  application launch
    1) "before each" hook for "shows an initial window"


  0 passing (6s)
  1 failing

  1) application launch "before each" hook for "shows an initial window":
     Error: ChromeDriver did not start within 5000ms
      at Error (native)
      at node_modules/spectron/lib/chrome-driver.js:63:25
      at Request._callback (node_modules/spectron/lib/chrome-driver.js:121:45)
      at Request.self.callback (node_modules/request/request.js:186:22)
      at Request.<anonymous> (node_modules/request/request.js:1081:10)
      at IncomingMessage.<anonymous> (node_modules/request/request.js:1001:12)
      at endReadableNT (_stream_readable.js:974:12)
      at _combinedTickCallback (internal/process/next_tick.js:74:11)
      at process._tickCallback (internal/process/next_tick.js:98:9)

I’m on osx 10.11 with

• Electron 1.4.8
• Spectron 3.4.0
• Mocha 3.1.2
• node 6.5 and npm 3.10