Fix test failures on the bots

pkg/analyzer/test/src/task/strong/strong_test_helper.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.
 
 // TODO(jmesserly): this file needs to be refactored, it's a port from
 // package:dev_compiler's tests
 library test.src.task.strong.strong_test_helper;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/context/context.dart' show SdkAnalysisContext;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart' hide SdkAnalysisContext;
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/strong/checker.dart';
 import 'package:analyzer/src/task/strong/rules.dart';
 import 'package:logging/logging.dart'; // TODO(jmesserly): remove
 import 'package:source_span/source_span.dart'; // TODO(jmesserly): remove
 import 'package:unittest/unittest.dart';
+import 'package:plugin/manager.dart';
 
 /// Run the checker on a program with files contents as indicated in
 /// [testFiles].
 ///
 /// This function makes several assumptions to make it easier to describe error
 /// expectations:
 ///
 ///   * a file named `/main.dart` exists in [testFiles].
 ///   * all expected failures are listed in the source code using comments
 ///   immediately in front of the AST node that should contain the error.
 ///   * errors are formatted as a token `level:Type`, where `level` is the
 ///   logging level were the error would be reported at, and `Type` is the
 ///   concrete subclass of [StaticInfo] that denotes the error.
 ///
 /// For example, to check that an assignment produces a warning about a boxing
 /// conversion, you can describe the test as follows:
 ///
 ///     testChecker({
 ///       '/main.dart': '''
 ///           testMethod() {
 ///             dynamic x = /*warning:Box*/3;
 ///           }
 ///       '''
 ///     });
 ///
 void testChecker(String name, Map<String, String> testFiles) {
   test(name, () {
+    ExtensionManager extensionManager = new ExtensionManager();
+    extensionManager.processPlugins(AnalysisEngine.instance.supportedPlugins);
+
     expect(testFiles.containsKey('/main.dart'), isTrue,
         reason: '`/main.dart` is missing in testFiles');
 
     var provider = new MemoryResourceProvider();
     testFiles.forEach((key, value) {
       var scheme = 'package:';
       if (key.startsWith(scheme)) {
         key = '/packages/${key.substring(scheme.length)}';
       }
       provider.newFile(key, value);
@@ skipping 431 matching lines @@
   if (levelName == 'warning') return _MAGENTA_COLOR;
   if (levelName == 'info') return _CYAN_COLOR;
   return null;
 }
 
 const String _RED_COLOR = '\u001b[31m';
 const String _MAGENTA_COLOR = '\u001b[35m';
 const String _CYAN_COLOR = '\u001b[36m';
 const String GREEN_COLOR = '\u001b[32m';
 const String NO_COLOR = '\u001b[0m';