Chaining not just element requests but also summaries access.

pkg/analyzer/test/src/summary/resynthesize_test.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 test.src.serialization.elements_test;
 
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/element_handle.dart';
 import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/resolver.dart' show Namespace;
+import 'package:analyzer/src/generated/resolver.dart'
+    show Namespace, TypeProvider;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/resynthesize.dart';
 import 'package:analyzer/src/summary/summarize_elements.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../generated/resolver_test.dart';
 import '../../reflective_tests.dart';
 
 main() {
@@ skipping 571 matching lines @@
       return new LinkedLibrary.fromBuffer(serialized.linked.toBuffer());
     }
     Map<String, LinkedLibrary> linkedSummaries = <String, LinkedLibrary>{
       uri: getLinkedSummaryFor(original)
     };
     for (Source source in otherLibrarySources) {
       LibraryElement original = resolve2(source);
       String uri = source.uri.toString();
       linkedSummaries[uri] = getLinkedSummaryFor(original);
     }
-    LinkedLibrary getLinkedSummary(String uri) {
-      LinkedLibrary serializedLibrary = linkedSummaries[uri];
-      if (serializedLibrary == null) {
-        fail('Unexpectedly tried to get linked summary for $uri');
-      }
-      return serializedLibrary;
-    }
-    UnlinkedUnit getUnlinkedSummary(String uri) {
-      UnlinkedUnit serializedUnit = unlinkedSummaries[uri];
-      if (serializedUnit == null) {
-        fail('Unexpectedly tried to get unlinked summary for $uri');
-      }
-      return serializedUnit;
-    }
-    SummaryResynthesizer resynthesizer = new SummaryResynthesizer(
+    _TestSummaryResynthesizer resynthesizer = new _TestSummaryResynthesizer(
         null,
         analysisContext,
         analysisContext.typeProvider,
-        (_) => true,
-        getLinkedSummary,
-        getUnlinkedSummary,
-        analysisContext.sourceFactory);
+        analysisContext.sourceFactory,
+        unlinkedSummaries,
+        linkedSummaries);
     LibraryElementImpl resynthesized = resynthesizer.getLibraryElement(uri);
     // Check that no other summaries needed to be resynthesized to resynthesize
     // the library element.
     expect(resynthesizer.resynthesisCount, 1);
     return resynthesized;
   }
 
   test_class_alias() {
     checkLibrary('class C = D with E, F; class D {} class E {} class F {}');
   }
@@ skipping 948 matching lines @@
   test_variable_setterInPart_getterInPart() {
     addNamedSource('/a.dart', 'part of my.lib; void set x(int _) {}');
     addNamedSource('/b.dart', 'part of my.lib; int get x => 42;');
     checkLibrary('library my.lib; part "a.dart"; part "b.dart";');
   }
 
   test_variables() {
     checkLibrary('int i; int j;');
   }
 }
+
+class _TestSummaryResynthesizer extends SummaryResynthesizer {
+  final Map<String, UnlinkedUnit> unlinkedSummaries;
+  final Map<String, LinkedLibrary> linkedSummaries;
+
+  _TestSummaryResynthesizer(
+      SummaryResynthesizer parent,
+      AnalysisContext context,
+      TypeProvider typeProvider,
+      SourceFactory sourceFactory,
+      this.unlinkedSummaries,
+      this.linkedSummaries)
+      : super(parent, context, typeProvider, sourceFactory);
+
+  @override
+  LinkedLibrary getLinkedSummary(String uri) {
+    LinkedLibrary serializedLibrary = linkedSummaries[uri];
+    if (serializedLibrary == null) {
+      fail('Unexpectedly tried to get linked summary for $uri');
+    }
+    return serializedLibrary;
+  }
+
+  @override
+  UnlinkedUnit getUnlinkedSummary(String uri) {
+    UnlinkedUnit serializedUnit = unlinkedSummaries[uri];
+    if (serializedUnit == null) {
+      fail('Unexpectedly tried to get unlinked summary for $uri');
+    }
+    return serializedUnit;
+  }
+
+  @override
+  bool hasLibrarySummary(String uri) {
+    return true;
+  }
+}