| // Copyright 2013 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| library quiver.iterables.enumerate_test; |
| |
| import 'package:test/test.dart'; |
| import 'package:quiver/iterables.dart'; |
| |
| main() { |
| group('enumerate', () { |
| test("should add indices to its argument", () { |
| var e = enumerate(['a', 'b', 'c']); |
| expect(e.map((v) => v.index), [0, 1, 2]); |
| expect(e.map((v) => v.value), ['a', 'b', 'c']); |
| }); |
| |
| test("should return an empty iterable given an empty iterable", () { |
| expect(enumerate([]), []); |
| }); |
| |
| test("should add indices to its argument", () { |
| var e = enumerate(['a', 'b', 'c']); |
| expect(e.map((v) => v.index), [0, 1, 2]); |
| expect(e.map((v) => v.index), [0, 1, 2], |
| reason: 'should enumerate to the same values a second time'); |
| }); |
| |
| test("first", () { |
| var e = enumerate(['a', 'b', 'c']); |
| expect(e.first.value, 'a'); |
| expect(e.first.index, 0); |
| expect(e.first.value, 'a'); |
| }); |
| |
| test("last", () { |
| var e = enumerate(['a', 'b', 'c']); |
| expect(e.last.value, 'c'); |
| expect(e.last.index, 2); |
| expect(e.last.value, 'c'); |
| }); |
| |
| test("single", () { |
| var e = enumerate(['a']); |
| expect(e.single.value, 'a'); |
| expect(e.single.index, 0); |
| expect(e.single.value, 'a'); |
| |
| expect(() => enumerate([1, 2]).single, throws); |
| }); |
| |
| test("length", () { |
| expect(enumerate([7, 8, 9]).length, 3); |
| }); |
| |
| test("elementAt", () { |
| var list = ['a', 'b', 'c']; |
| var e = enumerate(list); |
| for (int i = 2; i >= 0; i--) { |
| expect(e.elementAt(i).value, list[i]); |
| expect(e.elementAt(i).index, i); |
| } |
| }); |
| |
| test("equals and hashcode", () { |
| var list = ['a', 'b', 'c']; |
| var e1 = enumerate(list); |
| var e2 = enumerate(list); |
| for (int i = 0; i < 2; i++) { |
| expect(e1.elementAt(i), e2.elementAt(i)); |
| expect(e1.elementAt(i).hashCode, e1.elementAt(i).hashCode); |
| expect(identical(e1.elementAt(i), e2.elementAt(i)), isFalse); |
| } |
| }); |
| }); |
| } |