| // Copyright (c) 2017, 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. |
| |
| import "package:async/async.dart"; |
| import "package:test/test.dart"; |
| |
| final someStack = StackTrace.current; |
| Result<T> res<T>(T n) => Result<T>.value(n); |
| Result err(n) => ErrorResult("$n", someStack); |
| |
| /// Helper function creating an iterable of results. |
| Iterable<Result<int>> results(int count, {bool throwWhen(int index)}) sync* { |
| for (int i = 0; i < count; i++) { |
| if (throwWhen != null && throwWhen(i)) { |
| yield err(i); |
| } else { |
| yield res(i); |
| } |
| } |
| } |
| |
| main() { |
| expectAll(result, expectation) { |
| if (expectation.isError) { |
| expect(result, expectation); |
| } else { |
| expect(result.isValue, true); |
| expect(result.asValue.value, expectation.asValue.value); |
| } |
| } |
| |
| test("empty", () { |
| expectAll(Result.flattenAll<int>(results(0)), res([])); |
| }); |
| test("single value", () { |
| expectAll(Result.flattenAll<int>(results(1)), res([0])); |
| }); |
| test("single error", () { |
| expectAll( |
| Result.flattenAll<int>(results(1, throwWhen: (_) => true)), err(0)); |
| }); |
| test("multiple values", () { |
| expectAll(Result.flattenAll<int>(results(5)), res([0, 1, 2, 3, 4])); |
| }); |
| test("multiple errors", () { |
| expectAll(Result.flattenAll<int>(results(5, throwWhen: (x) => x.isOdd)), |
| err(1)); // First error is result. |
| }); |
| test("error last", () { |
| expectAll( |
| Result.flattenAll<int>(results(5, throwWhen: (x) => x == 4)), err(4)); |
| }); |
| } |