mirror of
https://github.com/alibaba/flutter-go.git
synced 2025-07-19 02:50:16 +08:00
115 lines
3.2 KiB
Dart
115 lines
3.2 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
import 'package:flutter_web/foundation.dart';
|
|
|
|
import '../flutter_test_alternative.dart';
|
|
|
|
int yieldCount;
|
|
|
|
Iterable<int> range(int start, int end) sync* {
|
|
assert(yieldCount == 0);
|
|
for (int index = start; index <= end; index += 1) {
|
|
yieldCount += 1;
|
|
yield index;
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
setUp(() {
|
|
yieldCount = 0;
|
|
});
|
|
|
|
test('The Caching Iterable: length caches', () {
|
|
final Iterable<int> i = CachingIterable<int>(range(1, 5).iterator);
|
|
expect(yieldCount, equals(0));
|
|
expect(i.length, equals(5));
|
|
expect(yieldCount, equals(5));
|
|
|
|
expect(i.length, equals(5));
|
|
expect(yieldCount, equals(5));
|
|
|
|
expect(i.last, equals(5));
|
|
expect(yieldCount, equals(5));
|
|
|
|
expect(i, equals(<int>[1, 2, 3, 4, 5]));
|
|
expect(yieldCount, equals(5));
|
|
});
|
|
|
|
test('The Caching Iterable: laziness', () {
|
|
final Iterable<int> i = CachingIterable<int>(range(1, 5).iterator);
|
|
expect(yieldCount, equals(0));
|
|
|
|
expect(i.first, equals(1));
|
|
expect(yieldCount, equals(1));
|
|
|
|
expect(i.firstWhere((int i) => i == 3), equals(3));
|
|
expect(yieldCount, equals(3));
|
|
|
|
expect(i.last, equals(5));
|
|
expect(yieldCount, equals(5));
|
|
});
|
|
|
|
test('The Caching Iterable: where and map', () {
|
|
final Iterable<int> integers = CachingIterable<int>(range(1, 5).iterator);
|
|
expect(yieldCount, equals(0));
|
|
|
|
final Iterable<int> evens = integers.where((int i) => i % 2 == 0);
|
|
expect(yieldCount, equals(0));
|
|
|
|
expect(evens.first, equals(2));
|
|
expect(yieldCount, equals(2));
|
|
|
|
expect(integers.first, equals(1));
|
|
expect(yieldCount, equals(2));
|
|
|
|
expect(evens.map<int>((int i) => i + 1), equals(<int>[3, 5]));
|
|
expect(yieldCount, equals(5));
|
|
|
|
expect(evens, equals(<int>[2, 4]));
|
|
expect(yieldCount, equals(5));
|
|
|
|
expect(integers, equals(<int>[1, 2, 3, 4, 5]));
|
|
expect(yieldCount, equals(5));
|
|
});
|
|
|
|
test('The Caching Iterable: take and skip', () {
|
|
final Iterable<int> integers = CachingIterable<int>(range(1, 5).iterator);
|
|
expect(yieldCount, equals(0));
|
|
|
|
final Iterable<int> secondTwo = integers.skip(1).take(2);
|
|
|
|
expect(yieldCount, equals(0));
|
|
expect(secondTwo, equals(<int>[2, 3]));
|
|
expect(yieldCount, equals(3));
|
|
|
|
final Iterable<int> result =
|
|
integers.takeWhile((int i) => i < 4).skipWhile((int i) => i < 3);
|
|
|
|
expect(result, equals(<int>[3]));
|
|
expect(yieldCount, equals(4));
|
|
expect(integers, equals(<int>[1, 2, 3, 4, 5]));
|
|
expect(yieldCount, equals(5));
|
|
});
|
|
|
|
test('The Caching Iterable: expand', () {
|
|
final Iterable<int> integers = CachingIterable<int>(range(1, 5).iterator);
|
|
expect(yieldCount, equals(0));
|
|
|
|
final Iterable<int> expanded1 =
|
|
integers.expand<int>((int i) => <int>[i, i]);
|
|
|
|
expect(yieldCount, equals(0));
|
|
expect(expanded1, equals(<int>[1, 1, 2, 2, 3, 3, 4, 4, 5, 5]));
|
|
expect(yieldCount, equals(5));
|
|
|
|
final Iterable<int> expanded2 =
|
|
integers.expand<int>((int i) => <int>[i, i]);
|
|
|
|
expect(yieldCount, equals(5));
|
|
expect(expanded2, equals(<int>[1, 1, 2, 2, 3, 3, 4, 4, 5, 5]));
|
|
expect(yieldCount, equals(5));
|
|
});
|
|
}
|