Fix cross-partition dependency handling (issue 26466)

pkg/analyzer/test/src/task/dart_work_manager_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 analyzer.test.src.task.dart_work_manager_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart' show ScannerErrorCode;
 import 'package:analyzer/src/generated/engine.dart'
@@ skipping 756 matching lines @@
 class _InternalAnalysisContextMock extends TypedMock
     implements InternalAnalysisContext {
   @override
   CachePartition privateAnalysisCachePartition;
 
   @override
   AnalysisCache analysisCache;
 
   Map<Source, ChangeNoticeImpl> _pendingNotices = <Source, ChangeNoticeImpl>{};
 
+  @override
+  final ReentrantSynchronousStream<InvalidatedResult> onResultInvalidated =
+      new ReentrantSynchronousStream<InvalidatedResult>();
+
   _InternalAnalysisContextMock() {
     privateAnalysisCachePartition = new UniversalCachePartition(this);
     analysisCache = new AnalysisCache([privateAnalysisCachePartition]);
+    analysisCache.onResultInvalidated.listen((InvalidatedResult event) {
+      onResultInvalidated.add(event);
+    });
   }
 
   @override
   CacheEntry getCacheEntry(AnalysisTarget target) {
     CacheEntry entry = analysisCache.get(target);
     if (entry == null) {
       entry = new CacheEntry(target);
       analysisCache.put(entry);
     }
     return entry;
   }
 
   @override
   ChangeNoticeImpl getNotice(Source source) {
     return _pendingNotices.putIfAbsent(
         source, () => new ChangeNoticeImpl(source));
   }
 }
 
 class _SourceFactoryMock extends TypedMock implements SourceFactory {}
 
 class _SourceMock extends TypedMock implements Source {
   final String shortName;
   _SourceMock(this.shortName);
   @override
   String get fullName => '/' + shortName;
   @override
   String toString() => fullName;
 }