Clean-up the registration of plugins

pkg/analyzer/test/generated/test_support.dart

Index: pkg/analyzer/test/generated/test_support.dart
diff --git a/pkg/analyzer/test/generated/test_support.dart b/pkg/analyzer/test/generated/test_support.dart
index 20cc0e2633937cf63bf8b7beb51ac0a9090b6df7..06f51d7fc4cdbd666f32ba6414c2ee13889af369 100644
--- a/pkg/analyzer/test/generated/test_support.dart
+++ b/pkg/analyzer/test/generated/test_support.dart
@@ -13,6 +13,7 @@ import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:plugin/manager.dart';
 import 'package:unittest/unittest.dart';
 
 import 'resolver_test.dart';
@@ -91,7 +92,10 @@ class EngineTestCase {
     return null;
   }
 
-  void setUp() {}
+  void setUp() {
+    new ExtensionManager()
+        .processPlugins(AnalysisEngine.instance.supportedPlugins);
+  }
 
   void tearDown() {}
 
@@ -557,10 +561,6 @@ class TestSource extends Source {
    */
   bool generateExceptionOnRead = false;
 
-  @override
-  int get modificationStamp =>
-      generateExceptionOnRead ? -1 : _modificationStamp;
-
   /**
    * The number of times that the contents of this source have been requested.
    */
@@ -586,10 +586,15 @@ class TestSource extends Source {
   }
 
   int get hashCode => 0;
+
   bool get isInSystemLibrary {
     return false;
   }
 
+  @override
+  int get modificationStamp =>
+      generateExceptionOnRead ? -1 : _modificationStamp;
+
   String get shortName {
     return _name;
   }