Switch analyzer_cli to 'package:test'.

pkg/analyzer_cli/test/embedder_test.dart

 // Copyright (c) 2016, 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:io';
 
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer_cli/src/driver.dart' show Driver, errorSink, outSink;
 import 'package:path/path.dart' as path;
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'utils.dart';
 
 main() {
-  initializeTestEnvironment();
-
   group('_embedder.yaml', () {
     StringSink savedOutSink, savedErrorSink;
     int savedExitCode;
 
     setUp(() {
       savedOutSink = outSink;
       savedErrorSink = errorSink;
       savedExitCode = exitCode;
       outSink = new StringBuffer();
       errorSink = new StringBuffer();
@@ skipping 43 matching lines @@
         print(outSink);
       }
       if (errorSink.toString().isNotEmpty) {
         print('stderr:');
         print(errorSink);
       }
       throw e;
     }
   };
 }