dart-sdk/tests/html/gamepad_test.dart

import 'package:unittest/unittest.dart';
import 'package:unittest/html_config.dart';
import 'dart:html';

main() {
  var isGamepadList =
      predicate((x) => x is List<Gamepad>, 'is a List<Gamepad>');

  insertTestDiv() {
    var element = new Element.tag('div');
    element.innerHtml = r'''
    A large block of text should go here. Click this
    block of text multiple times to see each line
    highlight with every click of the mouse button.
    ''';
    document.body.append(element);
    return element;
  }

  useHtmlConfiguration();

  test("getGamepads", () {
    insertTestDiv();
    var gamepads = window.navigator.getGamepads();
    expect(gamepads, isGamepadList);
    for (var gamepad in gamepads) {
      if (gamepad != null) {
        expect(gamepad.id, isNotNull);
      }
    }
  });
}