lrn@google.com
2985f3462e
You can use new IterableZip([it1, it2, it3]) to generate an iterable of three-element lists, one from each source iterable, as long as all three source iterables have an element. Similar functionality for streams is provided by StreamZip. R=floitsch@google.com Review URL: https://codereview.chromium.org//18015002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24835 260f80e4-7a28-3924-810f-c04153c831b5
113 lines
3.6 KiB
Dart
113 lines
3.6 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 "dart:collection";
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import "package:sequence_zip/iterable_zip.dart";
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import "package:unittest/unittest.dart";
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/// Iterable like [base] except that it throws when value equals [errorValue].
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Iterable iterError(Iterable base, int errorValue) {
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return base.map((x) => x == errorValue ? throw "BAD" : x);
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}
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main() {
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test("Basic", () {
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expect(new IterableZip([[1, 2, 3], [4, 5, 6], [7, 8, 9]]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Uneven length 1", () {
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expect(new IterableZip([[1, 2, 3, 99, 100], [4, 5, 6], [7, 8, 9]]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Uneven length 2", () {
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expect(new IterableZip([[1, 2, 3], [4, 5, 6, 99, 100], [7, 8, 9]]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Uneven length 3", () {
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expect(new IterableZip([[1, 2, 3], [4, 5, 6], [7, 8, 9, 99, 100]]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Uneven length 3", () {
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expect(new IterableZip([[1, 2, 3, 98], [4, 5, 6], [7, 8, 9, 99, 100]]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Empty 1", () {
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expect(new IterableZip([[], [4, 5, 6], [7, 8, 9]]), equals([]));
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});
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test("Empty 2", () {
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expect(new IterableZip([[1, 2, 3], [], [7, 8, 9]]), equals([]));
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});
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test("Empty 3", () {
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expect(new IterableZip([[1, 2, 3], [4, 5, 6], []]), equals([]));
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});
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test("Empty source", () {
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expect(new IterableZip([]), equals([]));
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});
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test("Single Source", () {
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expect(new IterableZip([[1, 2, 3]]), equals([[1], [2], [3]]));
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});
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test("Not-lists", () {
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// Use other iterables than list literals.
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Iterable it1 = [1, 2, 3, 4, 5, 6].where((x) => x < 4);
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Set it2 = new LinkedHashSet()..add(4)..add(5)..add(6);
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Iterable it3 = (new LinkedHashMap()..[7] = 0 ..[8] = 0 ..[9] = 0).keys;
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Iterable<Iterable> allIts =
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new Iterable.generate(3, (i) => [it1, it2, it3][i]);
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expect(new IterableZip(allIts),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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test("Error 1", () {
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expect(() => new IterableZip([iterError([1, 2, 3], 2),
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[4, 5, 6],
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[7, 8, 9]]).toList(),
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throwsA(equals("BAD")));
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});
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test("Error 2", () {
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expect(() => new IterableZip([[1, 2, 3],
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iterError([4, 5, 6], 5),
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[7, 8, 9]]).toList(),
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throwsA(equals("BAD")));
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});
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test("Error 3", () {
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expect(() => new IterableZip([[1, 2, 3],
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[4, 5, 6],
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iterError([7, 8, 9], 8)]).toList(),
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throwsA(equals("BAD")));
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});
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test("Error at end", () {
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expect(() => new IterableZip([[1, 2, 3],
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iterError([4, 5, 6], 6),
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[7, 8, 9]]).toList(),
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throwsA(equals("BAD")));
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});
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test("Error before first end", () {
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expect(() => new IterableZip([iterError([1, 2, 3, 4], 4),
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[4, 5, 6],
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[7, 8, 9]]).toList(),
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throwsA(equals("BAD")));
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});
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test("Error after first end", () {
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expect(new IterableZip([[1, 2, 3],
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[4, 5, 6],
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iterError([7, 8, 9, 10], 10)]),
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equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
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});
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}
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