Prepare for decoupling analyzer ASTs from element model.

pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart

 // Copyright (c) 2014, 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.services.completion.dart.manager;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/completion_core.dart';
 import 'package:analysis_server/src/services/completion/completion_performance.dart';
 import 'package:analysis_server/src/services/completion/dart/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart/imported_reference_contributor.dart';
+import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'completion_contributor_util.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(CompletionManagerTest);
@@ skipping 45 matching lines @@
         .from(baseRequest, resultDescriptor: RESOLVED_UNIT1)
         .then((DartCompletionRequest request) {
       requestCompleter.complete(request);
     });
     request = await performAnalysis(200, requestCompleter);
 
     // Get the unresolved directives
     var directives = request.target.unit.directives;
 
     // Assert that the import does not have an export namespace
-    expect(directives[0].element?.library?.exportNamespace, isNull);
+    Element element = resolutionMap.elementDeclaredByDirective(directives[0]);
+    expect(element?.library?.exportNamespace, isNull);
 
     // Resolve directives
     var importCompleter = new Completer<List<ImportElement>>();
     request.resolveImports().then((List<ImportElement> elements) {
       importCompleter.complete(elements);
     });
     List<ImportElement> imports = await performAnalysis(200, importCompleter);
     expect(imports, hasLength(directives.length + 1));
 
     ImportElement importNamed(String expectedUri) {
       return imports.firstWhere((elem) => elem.uri == expectedUri, orElse: () {
         var importedNames = imports.map((elem) => elem.uri);
         fail('Failed to find $expectedUri in $importedNames');
       });
     }
 
     void assertImportedLib(String expectedUri) {
       ImportElement importElem = importNamed(expectedUri);
       expect(importElem.importedLibrary.exportNamespace, isNotNull);
     }
 
     // Assert that the new imports each have an export namespace
     assertImportedLib(null /* dart:core */);
     assertImportedLib('/libA.dart');
   }
 }