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// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
library js_extend_class_test;
import 'dart:html';
import 'package:js/js.dart';
import 'package:js/js_util.dart' as js_util;
import 'package:expect/minitest.dart';
class JSDate {
external get jsField;
external get jsMethod;
external set datePrototypeJSField(v);
external set datePrototypeJSMethod(v);
// Extending a JS class with a Dart class is only supported by DDC for now.
// We extend the Date class instead of a user defined JS class to avoid the
// hassle of ensuring the JS class exists before we use it.
class DartJsDate extends JSDate {
get dartField => 100;
int dartMethod(x) {
return x * 2;
main() {
// Monkey-patch the JS Date class.
datePrototypeJSField = 42;
datePrototypeJSMethod = allowInterop((x) => x * 10);
group('extend js class', () {
test('js class members', () {
var bar = new DartJsDate();
expect(bar.jsField, equals(42));
expect(bar.jsMethod(5), equals(50));
expect(bar.dartField, equals(100));
expect(bar.dartMethod(4), equals(8));
test('instance checks and casts', () {
var bar = new DartJsDate();
expect(bar is JSDate, isTrue);
expect(bar as JSDate, equals(bar));
test('dart subclass members', () {
var bar = new DartJsDate();
expect(bar.dartField, equals(100));
expect(bar.dartMethod(4), equals(8));