| // 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"; |
| |
| main() { |
| testEmpty(name, Iterable<int> it, [depth = 2]) { |
| Expect.isTrue(it.isEmpty, name); |
| Expect.isFalse(it.isNotEmpty, name); |
| Expect.equals(0, it.length, name); |
| Expect.isFalse(it.contains(null), name); |
| Expect.isFalse(it.any((x) => true), name); |
| Expect.isTrue(it.every((x) => false), name); |
| Expect.throwsStateError(() => it.first, name); |
| Expect.throwsStateError(() => it.last, name); |
| Expect.throwsStateError(() => it.single, name); |
| Expect.throwsRangeError(() => it.elementAt(0), name); |
| Expect.throwsStateError(() => it.reduce((a, b) => a), name); |
| Expect.throwsStateError(() => it.singleWhere((_) => true), name); |
| Expect.equals(42, it.fold(42, (a, b) => "not 42"), name); |
| Expect.equals(42, it.firstWhere((v) => true, orElse: () => 42), name); |
| Expect.equals(42, it.lastWhere((v) => true, orElse: () => 42), name); |
| Expect.equals("", it.join("separator"), name); |
| Expect.equals("()", it.toString(), name); |
| Expect.listEquals([], it.toList(), name); |
| Expect.listEquals([], it.toList(growable: false), name); |
| Expect.listEquals([], it.toList(growable: true), name); |
| Expect.equals(0, it.toSet().length, name); |
| // Doesn't throw: |
| it.forEach((v) => throw v); |
| for (var v in it) { |
| throw v; |
| } |
| // Check that returned iterables are also empty. |
| if (depth > 0) { |
| testEmpty("$name-map", it.map((x) => x), depth - 1); |
| testEmpty("$name-where", it.where((x) => true), depth - 1); |
| testEmpty("$name-expand", it.expand((x) => [x]), depth - 1); |
| testEmpty("$name-skip", it.skip(1), depth - 1); |
| testEmpty("$name-take", it.take(2), depth - 1); |
| testEmpty("$name-skipWhile", it.skipWhile((v) => false), depth - 1); |
| testEmpty("$name-takeWhile", it.takeWhile((v) => true), depth - 1); |
| } |
| } |
| |
| testType(name, it, [depth = 2]) { |
| Expect.isTrue(it is Iterable<int>, name); |
| Expect.isFalse(it is Iterable<String>, name); |
| if (depth > 0) { |
| testType("$name-where", it.where((_) => true), depth - 1); |
| testType("$name-skip", it.skip(1), depth - 1); |
| testType("$name-take", it.take(1), depth - 1); |
| testType("$name-skipWhile", it.skipWhile((_) => false), depth - 1); |
| testType("$name-takeWhile", it.takeWhile((_) => true), depth - 1); |
| testType("$name-toList", it.toList(), depth - 1); |
| testType("$name-toList", it.toList(growable: false), depth - 1); |
| testType("$name-toList", it.toList(growable: true), depth - 1); |
| testType("$name-toSet", it.toSet(), depth - 1); |
| } |
| } |
| |
| test(name, it) { |
| testEmpty(name, it); |
| testType(name, it); |
| } |
| |
| test("const", const Iterable<int>.empty()); |
| test("new", new Iterable<int>.empty()); |
| } |