Make Storage implement Map.

client/tests/client/html/LocalStorageTests.dart

 // Copyright (c) 2012, 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.
 
 
 void testLocalStorage() {
   forLayoutTests();
-  test('GetItem', () {
-    final value = window.localStorage.getItem('does not exist');
-    Expect.isNull(value);
+
+  void testWithLocalStorage(String name, fn()) {
+    test(name, () {
+      window.localStorage['key1'] = 'val1';
+      window.localStorage['key2'] = 'val2';
+      window.localStorage['key3'] = 'val3';
+
+      try {
+        fn();
+      } finally {
+      window.localStorage.clear();
+      }
+    });
+  }
+
+  testWithLocalStorage('containsValue', () {
+    Expect.isFalse(window.localStorage.containsValue('does not exist'));
+    Expect.isFalse(window.localStorage.containsValue('key1'));
+    Expect.isTrue(window.localStorage.containsValue('val1'));
+    Expect.isTrue(window.localStorage.containsValue('val3'));
   });
-  test('SetItem', () {
-    final key = 'foo';
-    final value = 'bar';
-    window.localStorage.setItem(key, value);
-    final stored = window.localStorage.getItem(key);
-    Expect.equals(value, stored);
+
+  testWithLocalStorage('containsKey', () {
+    Expect.isFalse(window.localStorage.containsKey('does not exist'));
+    Expect.isFalse(window.localStorage.containsKey('val1'));
+    Expect.isTrue(window.localStorage.containsKey('key1'));
+    Expect.isTrue(window.localStorage.containsKey('key3'));
+  });
+
+  testWithLocalStorage('[]', () {
+    Expect.isNull(window.localStorage['does not exist']);
+    Expect.equals('val1', window.localStorage['key1']);
+    Expect.equals('val3', window.localStorage['key3']);
+  });
+
+  testWithLocalStorage('[]=', () {
+    Expect.isNull(window.localStorage['key4']);
+    window.localStorage['key4'] = 'val4';
+    Expect.equals('val4', window.localStorage['key4']);
+
+    Expect.equals('val3', window.localStorage['key3']);
+    window.localStorage['key3'] = 'val3-new';
+    Expect.equals('val3-new', window.localStorage['key3']);
+  });
+
+  testWithLocalStorage('putIfAbsent', () {
+    Expect.isNull(window.localStorage['key4']);
+    Expect.equals('val4',
+        window.localStorage.putIfAbsent('key4', () => 'val4'));
+    Expect.equals('val4', window.localStorage['key4']);
+
+    Expect.equals('val3', window.localStorage['key3']);
+    Expect.equals('val3', window.localStorage.putIfAbsent(
+            'key3', () => Expect.fail('should not be called')));
+    Expect.equals('val3', window.localStorage['key3']);
+  });
+
+  testWithLocalStorage('remove', () {
+    Expect.isNull(window.localStorage.remove('does not exist'));
+    Expect.equals('val3', window.localStorage.remove('key3'));
+    Expect.mapEquals({'key1': 'val1', 'key2': 'val2'}, window.localStorage);
+  });
+
+  testWithLocalStorage('clear', () {
+    window.localStorage.clear();
+    Expect.mapEquals({}, window.localStorage);
+  });
+
+  testWithLocalStorage('forEach', () {
+    Map<String, String> results = {};
+    window.localStorage.forEach((k, v) {
+      results[k] = v;
+    });
+    Expect.mapEquals({'key1': 'val1', 'key2': 'val2', 'key3': 'val3'},
+        results);
+  });
+
+  testWithLocalStorage('getKeys', () {
+    Expect.setEquals(['key1', 'key2', 'key3'], window.localStorage.getKeys());
+  });
+
+  testWithLocalStorage('getVals', () {
+    Expect.setEquals(['val1', 'val2', 'val3'],
+        window.localStorage.getValues());
+  });
+
+  testWithLocalStorage('length', () {
+    Expect.equals(3, window.localStorage.length);
+    window.localStorage.clear();
+    Expect.equals(0, window.localStorage.length);
+  });
+
+  testWithLocalStorage('isEmpty', () {
+    Expect.isFalse(window.localStorage.isEmpty());
+    window.localStorage.clear();
+    Expect.isTrue(window.localStorage.isEmpty());
   });
 }