lrn@google.com
2a7fb1c733
Review URL: https://codereview.chromium.org//12188011 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18123 260f80e4-7a28-3924-810f-c04153c831b5
41 lines
1.3 KiB
Dart
41 lines
1.3 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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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([], [].expand((x) { throw "not called"; }));
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// Creating the iterable doesn't call the function.
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[1].expand((x) { throw "not called"; });
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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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// 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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