Migrated test block 16 to Dart 2.0.

tests/corelib/map_from_test.dart

-// Copyright (c) 2011, 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.
-
-library map.from.test;
-
-import "package:expect/expect.dart";
-import 'dart:collection';
-
-main() {
-  testWithConstMap();
-  testWithNonConstMap();
-  testWithHashMap();
-  testWithLinkedMap();
-}
-
-testWithConstMap() {
-  var map = const {'b': 42, 'a': 43};
-  var otherMap = new Map.from(map);
-  Expect.isTrue(otherMap is Map);
-  Expect.isTrue(otherMap is HashMap);
-  Expect.isTrue(otherMap is LinkedHashMap);
-
-  Expect.equals(2, otherMap.length);
-  Expect.equals(2, otherMap.keys.length);
-  Expect.equals(2, otherMap.values.length);
-
-  var count = (map) {
-    int cnt = 0;
-    map.forEach((a, b) {
-      cnt += b;
-    });
-    return cnt;
-  };
-
-  Expect.equals(42 + 43, count(map));
-  Expect.equals(count(map), count(otherMap));
-}
-
-testWithNonConstMap() {
-  var map = {'b': 42, 'a': 43};
-  var otherMap = new Map.from(map);
-  Expect.isTrue(otherMap is Map);
-  Expect.isTrue(otherMap is HashMap);
-  Expect.isTrue(otherMap is LinkedHashMap);
-
-  Expect.equals(2, otherMap.length);
-  Expect.equals(2, otherMap.keys.length);
-  Expect.equals(2, otherMap.values.length);
-
-  int count(map) {
-    int count = 0;
-    map.forEach((a, b) {
-      count += b;
-    });
-    return count;
-  }
-
-  ;
-
-  Expect.equals(42 + 43, count(map));
-  Expect.equals(count(map), count(otherMap));
-
-  // Test that adding to the original map does not change otherMap.
-  map['c'] = 44;
-  Expect.equals(3, map.length);
-  Expect.equals(2, otherMap.length);
-  Expect.equals(2, otherMap.keys.length);
-  Expect.equals(2, otherMap.values.length);
-
-  // Test that adding to otherMap does not change the original map.
-  otherMap['c'] = 44;
-  Expect.equals(3, map.length);
-  Expect.equals(3, otherMap.length);
-  Expect.equals(3, otherMap.keys.length);
-  Expect.equals(3, otherMap.values.length);
-}
-
-testWithHashMap() {
-  var map = const {'b': 1, 'a': 2, 'c': 3};
-  var otherMap = new HashMap.from(map);
-  Expect.isTrue(otherMap is Map);
-  Expect.isTrue(otherMap is HashMap);
-  Expect.isTrue(otherMap is! LinkedHashMap);
-  var i = 1;
-  for (var val in map.values) {
-    Expect.equals(i++, val);
-  }
-}
-
-testWithLinkedMap() {
-  var map = const {'b': 1, 'a': 2, 'c': 3};
-  var otherMap = new LinkedHashMap.from(map);
-  Expect.isTrue(otherMap is Map);
-  Expect.isTrue(otherMap is HashMap);
-  Expect.isTrue(otherMap is LinkedHashMap);
-  var i = 1;
-  for (var val in map.values) {
-    Expect.equals(i++, val);
-  }
-}