LanguageFeatures/Spread-collections/DynamicSemantics_Map_A02_t09.dart

// 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 A list literal <E>[elem_1 ... elem_n] is evaluated as follows:
///
/// 2. For each entry in the map literal:
///    i. If entry is a spread element:
///       a. Evaluate the entry's expression to a value value.
///       b. If entry is null-aware and value is [null], continue to the next
///          entry in the literal.
///       c. Evaluate [value.entries.iterator] to a value iterator.
///       d. Loop:
///          a. If [iterator.moveNext()] returns [false], exit the loop.
///          b. Evaluate [iterator.current] to a value [newEntry].
///          c. Call map[newEntry.key] = newEntry.value.
///    ii. Else, entry has form [e1: e2]:
///       a. Evaluate [e1] to a value key.
///       b. Evaluate [e2] to a value value.
///       c. Call map[key] = value.
/// @description Checks that the same map can be spread twice.
/// @author iarkh@unipro.ru


import "dart:collection";
import "../../Utils/expect.dart";

Map map1 = {1: 1, 2: 2, 3: 3, 4: 4, 5: 5};
Map map2 = {4: 7, 2: 12};
Map verylongmap = {1: "test", 2: 248, 14: 10, -7: "-7", 100: 218, 13: -24.11,
  24: 14, 8: -8, 174: "13", 149: null, "12345": 12345, 27: 37, 222: null,
  -100: "-", 147: "", "": "", 100000: -100, 12456: -11, 23: 23, 25: 25, 17: 27,
  349: 2222222, -12345: "12345", 123: 123, 122: 122, 121: 121, 120: 249,
  "a": "a", "b": "b", "c": "c", "d": "d", "e": "e", "y": "y", -1000: -1000};

main() {
  Expect.mapEquals(map1, {...map1, ...map1});
  Expect.mapEquals(map2, {...map2, ...map2});
  Expect.mapEquals(verylongmap, {...verylongmap, ...verylongmap});
  Expect.mapEquals({}, {...{}, ...{}});
  Expect.mapEquals({73: 70, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5},
      {73: 70, 1: 14, ...map1, 3: 99, ...map1});
}