Reanalyze after creating a referenced part.

pkg/analyzer/test/src/task/dart_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.task.dart_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 963 matching lines @@
     expect(libraryElement.entryPoint, isNotNull);
   }
 
   test_perform_noSuchFilePart() {
     _performBuildTask({
       '/lib.dart': '''
 library lib;
 part 'no-such-file.dart';
 '''
     });
-    expect(libraryElement.parts, isEmpty);
+    expect(libraryElement.parts, hasLength(1));
+    CompilationUnitElement part = libraryElement.parts[0];
+    expect(part, isNotNull);
+    expect(part.source, isNotNull);
+    expect(part.library, same(libraryElement));
+    expect(context.exists(part.source), isFalse);
   }
 
   test_perform_patchTopLevelAccessors() {
     _performBuildTask({
       '/lib.dart': '''
 library lib;
 part 'part1.dart';
 part 'part2.dart';
 ''',
       '/part1.dart': '''
@@ skipping 1654 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result];
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }