Extract testing utilities into a separate package.

pkg/analysis_testing/lib/abstract_context.dart

Index: pkg/analysis_testing/lib/abstract_context.dart
diff --git a/pkg/analysis_server/test/abstract_context.dart b/pkg/analysis_testing/lib/abstract_context.dart
similarity index 94%
rename from pkg/analysis_server/test/abstract_context.dart
rename to pkg/analysis_testing/lib/abstract_context.dart
index f7ac28625059aa22782060a88fd9676f15d8112e..625f816c0780893a81db9ede708b933de7c0a1a1 100644
--- a/pkg/analysis_server/test/abstract_context.dart
+++ b/pkg/analysis_testing/lib/abstract_context.dart
@@ -2,8 +2,10 @@
 // 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 test.index;
+library testing.abstract_context;
 
+import 'package:analysis_testing/mock_sdk.dart';
+import 'package:analysis_testing/reflective_tests.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ -12,9 +14,6 @@ import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 
-import 'mocks.dart';
-import 'reflective_tests.dart';
-
 
 /**
  * Finds an [engine.Element] with the given [name].
@@ -45,8 +44,8 @@ typedef void _ElementVisitorFunction(Element element);
 class AbstractContextTest {
   static final DartSdk SDK = new MockSdk();
 
-  AnalysisContext context;
   MemoryResourceProvider provider = new MemoryResourceProvider();
+  AnalysisContext context;
 
   Source addSource(String path, String content) {
     File file = provider.newFile(path, content);