blob: ed918a773e2b0503834073be76fe732a47465b05 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
import "package:expect/expect.dart";
import 'dart:collection';
class MyList extends ListBase {
List list;
MyList(this.list);
get length => list.length;
set length(val) {
list.length = val;
}
operator [](index) => list[index];
operator []=(index, val) => list[index] = val;
String toString() => "[" + join(", ") + "]";
}
main() {
test(expectation, iterable) {
Expect.listEquals(expectation, iterable.toList());
}
// Function not called on empty iterable.
test(
[],
[].expand((x) {
throw "not called";
}));
// Creating the iterable doesn't call the function.
[1].expand((x) {
throw "not called";
});
test([1], [1].expand((x) => [x]));
test([1, 2, 3], [1, 2, 3].expand((x) => [x]));
test([], [1].expand((x) => []));
test([], [1, 2, 3].expand((x) => []));
test([2], [1, 2, 3].expand((x) => x == 2 ? [2] : []));
test([1, 1, 2, 2, 3, 3], [1, 2, 3].expand((x) => [x, x]));
test([1, 1, 2], [1, 2, 3].expand((x) => [x, x, x].skip(x)));
test([1], new MyList([1]).expand((x) => [x]));
test([1, 2, 3], new MyList([1, 2, 3]).expand((x) => [x]));
test([], new MyList([1]).expand((x) => []));
test([], new MyList([1, 2, 3]).expand((x) => []));
test([2], new MyList([1, 2, 3]).expand((x) => x == 2 ? [2] : []));
test([1, 1, 2, 2, 3, 3], new MyList([1, 2, 3]).expand((x) => [x, x]));
test([1, 1, 2], new MyList([1, 2, 3]).expand((x) => [x, x, x].skip(x)));
// if function throws, iteration is stopped.
Iterable iterable = [1, 2, 3].expand((x) {
if (x == 2) throw "FAIL";
return [x, x];
});
Iterator it = iterable.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.throws(it.moveNext, (e) => e == "FAIL");
// After throwing, iteration is ended.
Expect.equals(null, it.current);
Expect.isFalse(it.moveNext());
}