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![Johnni Winther](/assets/img/avatar_default.png)
Closes #41386 Change-Id: I1a5a4cdc35cef37c7a8ba6a6aecb99457789bcdc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144940 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
137 lines
4.6 KiB
Dart
137 lines
4.6 KiB
Dart
// Copyright (c) 2012, 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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main() {
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testOperations();
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}
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class ThrowMarker {
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const ThrowMarker();
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String toString() => "<<THROWS>>";
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}
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void testOperations() {
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// Comparison lists.
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var l = const [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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var r = const [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
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// A base list that starts out like l.
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var base = l.toList();
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// A lazy reverse of base.
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var reversed = base.reversed;
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Expect.listEquals(r, reversed.toList());
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Expect.listEquals(l, reversed.toList().reversed.toList());
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for (int i = 0; i < r.length; i++) {
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Expect.equals(r[i], reversed.elementAt(i));
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}
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Expect.equals(4, base.indexOf(5));
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Expect.equals(5, reversed.toList().indexOf(5));
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// Reversed followed by combinations of skip and take.
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List subr = [8, 7, 6, 5, 4, 3];
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Expect.listEquals(subr, reversed.skip(2).take(6).toList());
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Expect.listEquals(subr, reversed.take(8).skip(2).toList());
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Expect.listEquals(subr,
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reversed.toList().reversed.skip(2).take(6).toList().reversed.toList());
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Expect.listEquals(subr,
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reversed.toList().reversed.take(8).skip(2).toList().reversed.toList());
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Expect.listEquals(subr,
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reversed.take(8).toList().reversed.take(6).toList().reversed.toList());
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Expect.listEquals(subr,
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reversed.toList().reversed.take(8).toList().reversed.take(6).toList());
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Expect.listEquals(subr,
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reversed.toList().reversed.skip(2).toList().reversed.skip(2).toList());
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Expect.listEquals(subr,
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reversed.skip(2).toList().reversed.skip(2).toList().reversed.toList());
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void testList(List<int> list) {
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var throws = const ThrowMarker();
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void testEquals(v1, v2, path) {
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if (v1 is Iterable) {
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Iterator i1 = v1.iterator;
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Iterator i2 = v2.iterator;
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int index = 0;
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while (i1.moveNext()) {
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Expect.isTrue(i2.moveNext(),
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"Too few actual values. Expected[$index] == ${i1.current}");
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testEquals(i1.current, i2.current, "$path[$index]");
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index++;
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}
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if (i2.moveNext()) {
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Expect.fail(
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"Too many actual values. Actual[$index] == ${i2.current}");
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}
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} else {
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Expect.equals(v1, v2, path);
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}
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}
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void testOp(operation(Iterable<int> reversedList), name) {
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var reversedList = [
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for (var i = 0; i < list.length; i++) list[list.length - 1 - i]
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];
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var reversed = list.reversed;
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var expect;
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try {
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expect = operation(reversedList);
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} catch (e) {
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expect = throws;
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}
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var actual;
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try {
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actual = operation(reversed);
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} catch (e) {
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actual = throws;
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}
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testEquals(expect, actual, "$name: $list");
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}
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testOp((i) => i.first, "first");
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testOp((i) => i.last, "last");
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testOp((i) => i.single, "single");
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testOp((i) => i.firstWhere((n) => n < 5), "firstWhere<5");
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testOp((i) => i.firstWhere((n) => n < 10), "firstWhere<10");
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testOp((i) => i.lastWhere((n) => n < 5), "lastWhere<5");
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testOp((i) => i.lastWhere((n) => n < 10), "lastWhere<10");
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testOp((i) => i.singleWhere((n) => n < 5), "singelWhere<5");
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testOp((i) => i.singleWhere((n) => n < 10), "singelWhere<10");
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testOp((i) => i.contains(5), "contains(5)");
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testOp((i) => i.contains(10), "contains(10)");
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testOp((i) => i.any((n) => n < 5), "any<5");
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testOp((i) => i.any((n) => n < 10), "any<10");
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testOp((i) => i.every((n) => n < 5), "every<5");
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testOp((i) => i.every((n) => n < 10), "every<10");
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testOp((i) => i.reduce((a, b) => a + b), "reduce-sum");
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testOp((i) => i.fold<int>(0, (a, b) => a + b), "fold-sum");
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testOp((i) => i.join("-"), "join-");
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testOp((i) => i.join(""), "join");
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testOp((i) => i.join(), "join-null");
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testOp((i) => i.map((n) => n * 2), "map*2");
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testOp((i) => i.where((n) => n < 5), "where<5");
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testOp((i) => i.where((n) => n < 10), "where<10");
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testOp((i) => i.expand((n) => []), "expand[]");
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testOp((i) => i.expand((n) => [n]), "expand[n]");
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testOp((i) => i.expand((n) => [n, n]), "expand[n, n]");
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}
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// Combinations of lists with 0, 1 and more elements.
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testList([]);
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testList([0]);
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testList([10]);
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testList([0, 1]);
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testList([0, 10]);
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testList([10, 11]);
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testList([0, 5, 10]);
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testList([10, 5, 0]);
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testList([0, 1, 2, 3]);
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testList([3, 4, 5, 6]);
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testList([10, 11, 12, 13]);
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// Reverse const list.
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Expect.listEquals(r, l.reversed.toList());
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}
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