@enact/i18n/I18nDecorator/tests/windowFocus-specs.js

Internationalization support for Enact using iLib

"use strict";

var _windowFocus = require("../windowFocus");
describe('windowFocus', function () {
  var dispatchFocus = function dispatchFocus() {
    return window.dispatchEvent(new window.FocusEvent('focus'));
  };
  var dispatchBlur = function dispatchBlur() {
    return window.dispatchEvent(new window.FocusEvent('blur'));
  };
  describe('at launch', function () {
    test('should invoke fn immediately', function () {
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fn);
      var expected = 1;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
  });
  describe('when window focused', function () {
    beforeEach(dispatchFocus);
    afterEach(dispatchBlur);
    test('should invoke fn immediately', function () {
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fn);
      var expected = 1;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
  });
  describe('when window blurred', function () {
    beforeEach(dispatchBlur);
    afterEach(dispatchFocus);
    test('should not invoke fn', function () {
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fn);
      var expected = 0;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
    test('should invoke fn after focus', function () {
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fn);
      var expected = 0;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
      dispatchFocus();
      expected = 1;
      actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
    test('should invoke fn only once after focus when queued multiple times', function () {
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fn);
      (0, _windowFocus.onWindowFocus)(fn);
      (0, _windowFocus.onWindowFocus)(fn);
      (0, _windowFocus.onWindowFocus)(fn);
      dispatchFocus();
      var expected = 1;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
    test('should continue if a handler throws', function () {
      var fails = function fails() {
        throw new Error('Failed');
      };
      var fn = jest.fn();
      (0, _windowFocus.onWindowFocus)(fails);
      (0, _windowFocus.onWindowFocus)(fn);
      dispatchFocus();
      var expected = 1;
      var actual = fn.mock.calls.length;
      expect(actual).toEqual(expected);
    });
  });
});