Switch analyzer_cli to 'package:test'.

pkg/analyzer_cli/test/reporter_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.
 
 library analyzer_cli.test.formatter;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer_cli/src/error_formatter.dart';
+import 'package:test/test.dart' hide ErrorFormatter;
 import 'package:typed_mock/typed_mock.dart';
-import 'package:unittest/unittest.dart' hide ErrorFormatter;
 
 import 'mocks.dart';
 
 main() {
   group('reporter', () {
     var out = new StringBuffer();
     var stats = new AnalysisStats();
 
     setUp(() => stats.init());
     tearDown(() => out.clear());
@@ skipping 52 matching lines @@
   when(code.name).thenReturn('mock_code');
   when(error.errorCode).thenReturn(code);
   when(error.message).thenReturn('MSG');
   var source = new MockSource();
   when(source.fullName).thenReturn('/foo/bar/baz.dart');
   when(error.source).thenReturn(source);
   when(info.errors).thenReturn([error]);
 
   return info;
 }