| // Copyright (c) 2013, 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. |
| |
| // @dart = 2.7 |
| |
| // Test that loading of a library (with top-level functions only) can |
| // be deferred. |
| |
| import 'package:async_helper/async_helper.dart'; |
| import 'package:expect/expect.dart'; |
| |
| import 'deferred_function_library.dart' deferred as lib; |
| |
| bool isError(e) => e is Error; |
| |
| readFoo() { |
| return lib.foo; |
| } |
| |
| main() { |
| Expect.throws(() { |
| lib.foo('a'); |
| }, isError); |
| Expect.throws(readFoo, isError); |
| int counter = 0; |
| asyncStart(); |
| lib.loadLibrary().then((_) { |
| Expect.equals(1, ++counter); |
| print('lazy was loaded'); |
| Expect.equals(42, lib.foo('b')); |
| Expect.isNotNull(readFoo()); |
| asyncEnd(); |
| }); |
| Expect.equals(0, counter); |
| asyncStart(); |
| lib.loadLibrary().then((_) { |
| Expect.equals(2, ++counter); |
| print('lazy was loaded'); |
| Expect.equals(42, lib.foo('b')); |
| Expect.isNotNull(readFoo()); |
| asyncEnd(); |
| }); |
| Expect.equals(0, counter); |
| Expect.throws(() { |
| lib.foo('a'); |
| }, isError); |
| Expect.throws(readFoo, isError); |
| } |