Add corelib tests

test/codegen/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);
+  }
+}