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sdk/tests/lib/async/deferred/deferred_api_test.dart
T

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Dart

// 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.
// Test that that the basic API for deferred/lazy loading works. This
// test deliberately does not test that the deferred elements throw a
// NoSuchMethodError before the deferred library is loaded. This
// makes it possible to pass this test without having implemented
// deferred loading correctly.
import "package:expect/expect.dart";
import 'dart:async';
@lazy
import 'deferred_api_library.dart';
const lazy = const DeferredLibrary('deferred_api_library');
main() {
print('unittest-suite-wait-for-done');
int counter = 0;
lazy.load().then((bool didLoad) {
Expect.isTrue(didLoad);
Expect.equals(1, ++counter);
Expect.equals(42, foo('b'));
print('lazy was loaded');
});
Expect.equals(0, counter);
lazy.load().then((bool didLoad) {
Expect.isFalse(didLoad);
Expect.equals(2, ++counter);
Expect.equals(42, foo('b'));
print('lazy was loaded');
print('unittest-suite-success');
});
Expect.equals(0, counter);
}