selenium-webdriver-test.js

it("Can open main page", function () {
  return driver.get(extensionPage("main.html")).then(function () {
    return driver.wait(sw.until.elementLocated({
      css: ".city > canvas"
    }), 1000);
  }).then(function (cityCanvas) {
    return sw.promise.delayed(200).then(function () {
      return cityCanvas;
    });
  }).then(function (cityCanvas) {
    return canvasContainsDrawnPixels(cityCanvas);
  }).then(function (canvasContainsDrawnPixels) {
    expect(canvasContainsDrawnPixels).to.equal(true,
      "City canvas should have an image drawn on it");
  });
});