Add tests for summarizing / resynthesizing using only AST.

pkg/analyzer/lib/src/summary/summarize_elements.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 serialization.elements;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 119 matching lines @@
    * by 1.
    */
   static const int currentMinorVersion = 0;
 
   final List<String> _linkedLibraryUris = <String>[];
   final List<LinkedLibraryBuilder> _linkedLibraries = <LinkedLibraryBuilder>[];
   final List<String> _unlinkedUnitUris = <String>[];
   final List<UnlinkedUnitBuilder> _unlinkedUnits = <UnlinkedUnitBuilder>[];
   final List<String> _unlinkedUnitHashes = <String>[];
 
+  void addLinkedLibrary(String uri, LinkedLibraryBuilder library) {
+    _linkedLibraries.add(library);
+    _linkedLibraryUris.add(uri);
+  }
+
+  void addUnlinkedUnit(Source source, UnlinkedUnitBuilder unit) {
+    _unlinkedUnitUris.add(source.uri.toString());
+    _unlinkedUnits.add(unit);
+    _unlinkedUnitHashes.add(_hash(source.contents.data));
+  }
+
   /**
    * Add a fallback library to the package bundle, corresponding to the library
    * whose defining compilation unit is located at [source].  Caller must also
    * call [addFallbackUnit] for all compilation units contained in the library
    * (including the defining compilation unit).
    */
   void addFallbackLibrary(Source source) {
     String uri = source.uri.toString();
     _linkedLibraryUris.add(uri);
     _linkedLibraries.add(new LinkedLibraryBuilder(fallbackMode: true));
@@ skipping 1453 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }