mirror of
https://github.com/dart-lang/sdk
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284f662022
Change-Id: I764d0457da85b2935e1d83309eab4c4b5b3ea000 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/126204 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
75 lines
2.1 KiB
Dart
75 lines
2.1 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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import 'dart:collection';
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class MyList extends ListBase {
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List list;
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MyList(this.list);
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get length => list.length;
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set length(val) {
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list.length = val;
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}
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operator [](index) => list[index];
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operator []=(index, val) => list[index] = val;
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String toString() => "[" + join(", ") + "]";
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}
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main() {
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test(expectation, iterable) {
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Expect.listEquals(expectation, iterable.toList());
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}
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// Function not called on empty iterable.
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test(
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[],
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[].expand((x) {
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throw "not called";
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}));
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// Creating the iterable doesn't call the function.
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[1].expand((x) {
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throw "not called";
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});
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test([1], [1].expand((x) => [x]));
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test([1, 2, 3], [1, 2, 3].expand((x) => [x]));
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test([], [1].expand((x) => []));
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test([], [1, 2, 3].expand((x) => []));
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test([2], [1, 2, 3].expand((x) => x == 2 ? [2] : []));
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test([1, 1, 2, 2, 3, 3], [1, 2, 3].expand((x) => [x, x]));
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test([1, 1, 2], [1, 2, 3].expand((x) => [x, x, x].skip(x)));
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test([1], new MyList([1]).expand((x) => [x]));
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test([1, 2, 3], new MyList([1, 2, 3]).expand((x) => [x]));
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test([], new MyList([1]).expand((x) => []));
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test([], new MyList([1, 2, 3]).expand((x) => []));
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test([2], new MyList([1, 2, 3]).expand((x) => x == 2 ? [2] : []));
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test([1, 1, 2, 2, 3, 3], new MyList([1, 2, 3]).expand((x) => [x, x]));
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test([1, 1, 2], new MyList([1, 2, 3]).expand((x) => [x, x, x].skip(x)));
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// if function throws, iteration is stopped.
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Iterable iterable = [1, 2, 3].expand((x) {
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if (x == 2) throw "FAIL";
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return [x, x];
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});
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Iterator it = iterable.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(1, it.current);
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Expect.isTrue(it.moveNext());
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Expect.equals(1, it.current);
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Expect.throws(it.moveNext, (e) => e == "FAIL");
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// After throwing, iteration is ended.
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Expect.equals(null, it.current);
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Expect.isFalse(it.moveNext());
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}
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