| /* |
| * Copyright (c) 2019, 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. |
| */ |
| /** |
| * @assertion To handle these gracefully, we support a [...?] "null-aware |
| * spread" operator. In cases where the spread expression evaluates to [null], |
| * that expands to an empty collection instead of throwing a runtime expression. |
| * |
| * That turns the example to: |
| * |
| * var command = [ |
| * engineDartPath, |
| * '--target=flutter', |
| * ...?extraFrontEndOptions, |
| * mainPath |
| * ]; |
| * @description Checks that spreadable element of the [Map] can be null-aware |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| |
| import "../../Utils/expect.dart"; |
| |
| Map getAMap( |
| String engineDartPath, Map extraFrontEndOptions, String mainPath) { |
| return({1: engineDartPath, 2: "--target=flutter", ...?extraFrontEndOptions, |
| 3: mainPath}); |
| } |
| |
| main() { |
| Expect.mapEquals( |
| {1: "enginePath", 2: "--target=flutter", 0: "--option1", 3: "mainPath"}, |
| getAMap("enginePath", {0: "--option1"}, "mainPath")); |
| Expect.mapEquals({1: "enginePath", 2: "--target=flutter", 3: "mainPath"}, |
| getAMap("enginePath", null, "mainPath")); |
| } |
