Rename the package to "test".

test/frontend/matcher/completion_test.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:async';
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import '../../utils.dart';
 
 void main() {
   group("[completes]", () {
     test("blocks the test until the Future completes", () {
       return expectTestBlocks(() {
         var completer = new Completer();
         expect(completer.future, completes);
         return completer;
@@ skipping 73 matching lines @@
         expect(new Future.value('a'), completion(equals('b')));
       }).then((liveTest) {
         expectTestFailed(liveTest, startsWith(
             "Expected: 'b'\n"
             "  Actual: 'a'\n"
             "   Which: is different."));;
       });
     });
   });
 }