Issue 24566. Main AnalysisContext.getLibrariesContaining() should work also for SDK sources.

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 test.src.task.dart_work_manager_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show
@@ skipping 314 matching lines @@
     manager.libraryPartsMap[library1] = [part1];
     manager.libraryPartsMap[library2] = [part1, part2];
     // getLibrariesContainingPart
     expect(manager.getLibrariesContainingPart(part1),
         unorderedEquals([library1, library2]));
     expect(
         manager.getLibrariesContainingPart(part2), unorderedEquals([library2]));
     expect(manager.getLibrariesContainingPart(part3), isEmpty);
   }
 
+  void test_getLibrariesContainingPart_inSDK() {
+    Source part = new _SourceMock('part.dart');
+    when(part.isInSystemLibrary).thenReturn(true);
+    // SDK work manager
+    DartWorkManager sdkDartWorkManagerMock = new _DartWorkManagerMock();
+    when(sdkDartWorkManagerMock.getLibrariesContainingPart(part))
+        .thenReturn([source2, source3]);
+    // SDK context mock
+    InternalAnalysisContext sdkContextMock = new _InternalAnalysisContextMock();
+    when(sdkContextMock.workManagers).thenReturn([sdkDartWorkManagerMock]);
+    // SDK mock
+    DartSdk sdkMock = new _DartSdkMock();
+    when(sdkMock.context).thenReturn(sdkContextMock);
+    // SourceFactory mock
+    SourceFactory sourceFactory = new _SourceFactoryMock();
+    when(sourceFactory.dartSdk).thenReturn(sdkMock);
+    when(context.sourceFactory).thenReturn(sourceFactory);
+    // SDK source mock
+    Source source = new _SourceMock('test.dart');
+    when(source.source).thenReturn(source);
+    when(source.isInSystemLibrary).thenReturn(true);
+    // validate
+    expect(manager.getLibrariesContainingPart(part),
+        unorderedEquals([source2, source3]));
+  }
+
   void test_getNextResult_hasLibraries_firstIsError() {
     entry1.setErrorState(caughtException, [LIBRARY_ERRORS_READY]);
     manager.librarySourceQueue.addAll([source1, source2]);
     TargetedResult request = manager.getNextResult();
     expect(request.target, source2);
     expect(request.result, LIBRARY_ERRORS_READY);
     // source1 is out, source2 is waiting
     expect_librarySourceQueue([source2]);
   }
 
@@ skipping 432 matching lines @@
 
 class _SourceMock extends TypedMock implements Source {
   final String shortName;
   _SourceMock(this.shortName);
   @override
   String get fullName => '/' + shortName;
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
   @override
   String toString() => fullName;
 }