Link packages with an SDK extension.

pkg/analyzer/test/src/summary/pub_summary_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/idl.dart';
@@ skipping 501 matching lines @@
     expect(linkedPackages, hasLength(1));
 
     // package:aaa
     {
       LinkedPubPackage linkedPackage = linkedPackages
           .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
       _assertHasLinkedVariable(linkedPackage, 'a', 'A', 'src/a2.dart');
     }
   }
 
+  test_getLinkedBundles_useSdkExtension() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'dart:bbb';
+ExtB a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'dart:bbb';
+ExtB b;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/sdk_ext/extB.dart',
+        '''
+class ExtB {}
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/_sdkext',
+        '''
+{
+  "dart:bbb": "../sdk_ext/extB.dart"
+}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Now we should be able to get linked bundles.
+    PackageBundle sdkBundle = getSdkBundle(sdk);
+    List<LinkedPubPackage> linkedPackages =
+        manager.getLinkedBundles(context, sdkBundle);
+    expect(linkedPackages, hasLength(2));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'ExtB', 'dart:bbb');
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      _assertHasLinkedVariable(linkedPackage, 'b', 'ExtB', 'dart:bbb');
+    }
+  }
+
   test_getLinkedBundles_wrongScheme() async {
     resourceProvider.newFile(
         '$CACHE/aaa/lib/a.dart',
         '''
 import 'xxx:yyy/zzz.dart';
 Z a;
 ''');
 
     // Configure packages resolution.
     Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
@@ skipping 188 matching lines @@
     });
   }
 
   static PackageBundle _getBundleByPackageName(
       Map<PubPackage, PackageBundle> bundles, String name) {
     PubPackage package =
         bundles.keys.singleWhere((package) => package.name == name);
     return bundles[package];
   }
 }