Roll Observatory deps (charted -> ^0.3.0)

packages/usage/test/usage_impl_io_test.dart

 // Copyright (c) 2014, 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 usage.usage_impl_io_test;
 
 import 'dart:async';
 import 'dart:io';
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:usage/src/usage_impl_io.dart';
 
+main() => defineTests();
+
 void defineTests() {
   group('IOPostHandler', () {
     test('sendPost', () {
       var httpClient = new MockHttpClient();
       IOPostHandler postHandler = new IOPostHandler(mockClient: httpClient);
-      Map args = {'utv': 'varName', 'utt': 123};
+      Map<String, dynamic> args = {'utv': 'varName', 'utt': 123};
       return postHandler.sendPost('http://www.google.com', args).then((_) {
         expect(httpClient.sendCount, 1);
       });
     });
   });
 
   group('IOPersistentProperties', () {
     test('add', () {
       IOPersistentProperties props = new IOPersistentProperties('foo_props');
       props['foo'] = 'bar';
@@ skipping 36 matching lines @@
 
 class MockHttpClientResponse implements HttpClientResponse {
   final MockHttpClient client;
   MockHttpClientResponse(this.client);
   Future drain([var futureValue]) {
     client.sendCount++;
     return new Future.value();
   }
   noSuchMethod(Invocation invocation) { }
 }