Removed fixed dependencies

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

Index: packages/analyzer/test/src/summary/pub_summary_test.dart
diff --git a/packages/analyzer/test/src/summary/pub_summary_test.dart b/packages/analyzer/test/src/summary/pub_summary_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..62804a33b365aea29a9139afb9193e971949a97c
--- /dev/null
+++ b/packages/analyzer/test/src/summary/pub_summary_test.dart
@@ -0,0 +1,1368 @@
+// 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/file_system/file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/summary/format.dart';
+import 'package:analyzer/src/summary/idl.dart';
+import 'package:analyzer/src/summary/pub_summary.dart';
+import 'package:analyzer/src/summary/summarize_elements.dart';
+import 'package:analyzer/src/util/fast_uri.dart';
+import 'package:path/path.dart' as pathos;
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+import 'package:unittest/unittest.dart' hide ERROR;
+
+import '../../utils.dart';
+import '../context/abstract_context.dart';
+import '../context/mock_sdk.dart';
+
+main() {
+  initializeTestEnvironment();
+  defineReflectiveTests(PubSummaryManagerTest);
+}
+
+@reflectiveTest
+class PubSummaryManagerTest extends AbstractContextTest {
+  static const String CACHE = '/home/.pub-cache/hosted/pub.dartlang.org';
+
+  PubSummaryManager manager;
+
+  void setUp() {
+    super.setUp();
+    _createManager();
+  }
+
+  test_computeUnlinkedForFolder() async {
+    // Create package files.
+    resourceProvider.newFile(
+        '/flutter/aaa/lib/a.dart',
+        '''
+class A {}
+''');
+    resourceProvider.newFile(
+        '/flutter/bbb/lib/b.dart',
+        '''
+class B {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('/flutter/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('/flutter/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    await manager.computeUnlinkedForFolder('aaa', libFolderA);
+    await manager.computeUnlinkedForFolder('bbb', libFolderB);
+
+    // The files must be created.
+    _assertFileExists(libFolderA.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderA.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+  }
+
+  test_getLinkedBundles_cached() async {
+    String pathA1 = '$CACHE/aaa-1.0.0';
+    String pathA2 = '$CACHE/aaa-2.0.0';
+    resourceProvider.newFile(
+        '$pathA1/lib/a.dart',
+        '''
+class A {}
+int a;
+''');
+    resourceProvider.newFile(
+        '$pathA2/lib/a.dart',
+        '''
+class A2 {}
+int a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:aaa/a.dart';
+A b;
+''');
+    Folder folderA1 = resourceProvider.getFolder(pathA1);
+    Folder folderA2 = resourceProvider.getFolder(pathA2);
+    Folder folderB = resourceProvider.getFolder('$CACHE/bbb');
+
+    // Configure packages resolution.
+    Folder libFolderA1 = resourceProvider.newFolder('$pathA1/lib');
+    Folder libFolderA2 = resourceProvider.newFolder('$pathA2/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA1],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    // Session 1.
+    // Create linked bundles and store them in files.
+    String linkedHashA;
+    String linkedHashB;
+    {
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get linked bundles.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(2));
+
+      // Verify that files with linked bundles were created.
+      LinkedPubPackage packageA = _getLinkedPackage(linkedPackages, 'aaa');
+      LinkedPubPackage packageB = _getLinkedPackage(linkedPackages, 'bbb');
+      linkedHashA = packageA.linkedHash;
+      linkedHashB = packageB.linkedHash;
+      _assertFileExists(folderA1, 'linked_spec_$linkedHashA.ds');
+      _assertFileExists(folderB, 'linked_spec_$linkedHashB.ds');
+    }
+
+    // Session 2.
+    // Recreate manager and ask again.
+    {
+      _createManager();
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(2));
+
+      // Verify that linked packages have the same hashes, so they must
+      // be have been read from the previously created files.
+      LinkedPubPackage packageA = _getLinkedPackage(linkedPackages, 'aaa');
+      LinkedPubPackage packageB = _getLinkedPackage(linkedPackages, 'bbb');
+      expect(packageA.linkedHash, linkedHashA);
+      expect(packageB.linkedHash, linkedHashB);
+    }
+
+    // Session 2 with different 'aaa' version.
+    // Different linked bundles.
+    {
+      context.sourceFactory = new SourceFactory(<UriResolver>[
+        sdkResolver,
+        resourceResolver,
+        new PackageMapUriResolver(resourceProvider, {
+          'aaa': [libFolderA2],
+          'bbb': [libFolderB],
+        })
+      ]);
+
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get linked bundles.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(2));
+
+      // Verify that new files with linked bundles were created.
+      LinkedPubPackage packageA = _getLinkedPackage(linkedPackages, 'aaa');
+      LinkedPubPackage packageB = _getLinkedPackage(linkedPackages, 'bbb');
+      expect(packageA.linkedHash, isNot(linkedHashA));
+      expect(packageB.linkedHash, isNot(linkedHashB));
+      _assertFileExists(folderA2, 'linked_spec_${packageA.linkedHash}.ds');
+      _assertFileExists(folderB, 'linked_spec_${packageB.linkedHash}.ds');
+    }
+  }
+
+  test_getLinkedBundles_cached_declaredVariables_export() async {
+    await _testImpl_getLinkedBundles_cached_declaredVariables('export');
+  }
+
+  test_getLinkedBundles_cached_declaredVariables_import() async {
+    await _testImpl_getLinkedBundles_cached_declaredVariables('import');
+  }
+
+  test_getLinkedBundles_cached_differentSdk() async {
+    String pathA = '$CACHE/aaa';
+    resourceProvider.newFile(
+        '$pathA/lib/a.dart',
+        '''
+class A {}
+int a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:aaa/a.dart';
+A b;
+''');
+    Folder folderA = resourceProvider.getFolder(pathA);
+    Folder folderB = resourceProvider.getFolder('$CACHE/bbb');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$pathA/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    // Session 1.
+    // Create linked bundles and store them in files.
+    String linkedHashA;
+    String linkedHashB;
+    {
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get linked bundles.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(2));
+
+      // Verify that files with linked bundles were created.
+      LinkedPubPackage packageA = _getLinkedPackage(linkedPackages, 'aaa');
+      LinkedPubPackage packageB = _getLinkedPackage(linkedPackages, 'bbb');
+      linkedHashA = packageA.linkedHash;
+      linkedHashB = packageB.linkedHash;
+      _assertFileExists(folderA, 'linked_spec_$linkedHashA.ds');
+      _assertFileExists(folderB, 'linked_spec_$linkedHashB.ds');
+    }
+
+    // Session 2.
+    // Use DartSdk with a different API signature.
+    // Different linked bundles should be created.
+    {
+      MockSdk sdk = new MockSdk();
+      sdk.updateUriFile('dart:math', (String content) {
+        return content + '  class NewMathClass {}';
+      });
+      context.sourceFactory = new SourceFactory(<UriResolver>[
+        new DartUriResolver(sdk),
+        resourceResolver,
+        new PackageMapUriResolver(resourceProvider, {
+          'aaa': [libFolderA],
+          'bbb': [libFolderB],
+        })
+      ]);
+
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get linked bundles.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(2));
+
+      // Verify that new files with linked bundles were created.
+      LinkedPubPackage packageA = _getLinkedPackage(linkedPackages, 'aaa');
+      LinkedPubPackage packageB = _getLinkedPackage(linkedPackages, 'bbb');
+      expect(packageA.linkedHash, isNot(linkedHashA));
+      expect(packageB.linkedHash, isNot(linkedHashB));
+      _assertFileExists(folderA, 'linked_spec_${packageA.linkedHash}.ds');
+      _assertFileExists(folderB, 'linked_spec_${packageB.linkedHash}.ds');
+    }
+  }
+
+  test_getLinkedBundles_cached_inconsistent_majorVersion() async {
+    String pathA = '$CACHE/aaa';
+    resourceProvider.newFile(
+        '$pathA/lib/a.dart',
+        '''
+class A {}
+int a;
+''');
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$pathA/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+      })
+    ]);
+
+    // Session 1.
+    // Create the linked bundle and cache it in a file.
+    {
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get the linked bundle.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(1));
+    }
+
+    // Session 2.
+    // Recreate manager with a different major version.
+    // It cannot use the previously cache linked bundle.
+    // The reason is that we cannot use the cached unlinked bundle.
+    {
+      _createManager(majorVersion: 12345);
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, isEmpty);
+    }
+  }
+
+  test_getLinkedBundles_hasCycle() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b.dart';
+class A {}
+int a1;
+B a2;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:ccc/c.dart';
+class B {}
+C b;
+''');
+    resourceProvider.newFile(
+        '$CACHE/ccc/lib/c.dart',
+        '''
+import 'package:aaa/a.dart';
+import 'package:ddd/d.dart';
+class C {}
+A c1;
+D c2;
+''');
+    resourceProvider.newFile(
+        '$CACHE/ddd/lib/d.dart',
+        '''
+class D {}
+String d;
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    Folder libFolderC = resourceProvider.newFolder('$CACHE/ccc/lib');
+    Folder libFolderD = resourceProvider.newFolder('$CACHE/ddd/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+        'ccc': [libFolderC],
+        'ddd': [libFolderD],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Now we should be able to get linked bundles.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(4));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      expect(linkedPackage.linked.linkedLibraryUris, ['package:aaa/a.dart']);
+      _assertHasLinkedVariable(linkedPackage, 'a1', 'int',
+          expectedTypeNameUri: 'dart:core');
+      _assertHasLinkedVariable(linkedPackage, 'a2', 'B',
+          expectedTypeNameUri: 'package:bbb/b.dart');
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      expect(linkedPackage.linked.linkedLibraryUris, ['package:bbb/b.dart']);
+      _assertHasLinkedVariable(linkedPackage, 'b', 'C',
+          expectedTypeNameUri: 'package:ccc/c.dart');
+    }
+
+    // package:ccc
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'ccc');
+      expect(linkedPackage.linked.linkedLibraryUris, ['package:ccc/c.dart']);
+      _assertHasLinkedVariable(linkedPackage, 'c1', 'A',
+          expectedTypeNameUri: 'package:aaa/a.dart');
+      _assertHasLinkedVariable(linkedPackage, 'c2', 'D',
+          expectedTypeNameUri: 'package:ddd/d.dart');
+    }
+
+    // package:ddd
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'ddd');
+      expect(linkedPackage.linked.linkedLibraryUris, ['package:ddd/d.dart']);
+      _assertHasLinkedVariable(linkedPackage, 'd', 'String',
+          expectedTypeNameUri: 'dart:core');
+    }
+  }
+
+  test_getLinkedBundles_missingBundle_listed() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b.dart';
+B a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+class B {}
+''');
+
+    // 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 for 'aaa'.
+    await manager.computeUnlinkedForFolder('aaa', libFolderA);
+
+    // Try to link.
+    // Neither 'aaa' nor 'bbb' are linked.
+    // 'bbb' does not have the unlinked bundle.
+    // 'aaa' is not linked because it references 'bbb', which is listed.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(0));
+  }
+
+  test_getLinkedBundles_missingBundle_listed_chained() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b.dart';
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:ccc/c.dart';
+''');
+    resourceProvider.newFile(
+        '$CACHE/ccc/lib/c.dart',
+        '''
+class C {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    Folder libFolderC = resourceProvider.newFolder('$CACHE/ccc/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+        'ccc': [libFolderC],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    await manager.computeUnlinkedForFolder('aaa', libFolderA);
+    await manager.computeUnlinkedForFolder('bbb', libFolderB);
+
+    // Try to link.
+    // Neither 'aaa' nor 'bbb' are linked.
+    // 'ccc' is listed in the package map, but its unlinked bundle is not ready.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(0));
+  }
+
+  test_getLinkedBundles_missingBundle_listed_partial() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+int a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:ccc/c.dart';
+C b;
+''');
+    resourceProvider.newFile(
+        '$CACHE/ccc/lib/c.dart',
+        '''
+class C {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    Folder libFolderC = resourceProvider.newFolder('$CACHE/ccc/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+        'ccc': [libFolderC],
+      })
+    ]);
+
+    // Ensure unlinked bundles for 'aaa'.
+    await manager.computeUnlinkedForFolder('aaa', libFolderA);
+    await manager.computeUnlinkedForFolder('bbb', libFolderB);
+
+    // Try to link.
+    // Only 'aaa' is linked.
+    // The package 'bbb' references the listed 'ccc' without unlinked bundle.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(1));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'int',
+          expectedTypeNameUri: 'dart:core');
+    }
+  }
+
+  test_getLinkedBundles_missingBundle_notListed() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+int a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:ccc/c.dart';
+int b1;
+C b2;
+''');
+
+    // 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;
+
+    // Try to link.
+    // Both 'aaa' and 'bbb' are linked.
+    // The package 'ccc' is not listed, so it cannot be resolved anyway,
+    // with summaries or without them.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(2));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'int',
+          expectedTypeNameUri: 'dart:core');
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      _assertHasLinkedVariable(linkedPackage, 'b1', 'int',
+          expectedTypeNameUri: 'dart:core');
+      _assertHasLinkedVariable(linkedPackage, 'b2', 'C',
+          expectedToBeResolved: false);
+    }
+  }
+
+  test_getLinkedBundles_missingLibrary() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b2.dart';
+int a1;
+B2 a2;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+class B {}
+int b = 42;
+''');
+
+    // 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;
+
+    // Try to link.
+    // Both 'aaa' and 'bbb' are linked.
+    // The name 'B2' in 'a.dart' is not resolved.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(2));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a1', 'int',
+          expectedTypeNameUri: 'dart:core');
+      _assertHasLinkedVariable(linkedPackage, 'a2', 'B2',
+          expectedToBeResolved: false);
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      _assertHasLinkedVariable(linkedPackage, 'b', 'int',
+          expectedTypeNameUri: 'dart:core');
+    }
+  }
+
+  test_getLinkedBundles_missingLibrary_hasCycle() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b.dart';
+B a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:aaa/a.dart';
+import 'package:ccc/c2.dart';
+class B {}
+int b1;
+C2 b2;
+''');
+    resourceProvider.newFile(
+        '$CACHE/ccc/lib/c.dart',
+        '''
+class C {}
+int c;
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    Folder libFolderC = resourceProvider.newFolder('$CACHE/ccc/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+        'ccc': [libFolderC],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Try to link.
+    // All bundles 'aaa' and 'bbb' and 'ccc' are linked.
+    // The name 'C2' in 'b.dart' is not resolved.
+    // We have the corresponding unlinked bundle, and it is full, so if it does
+    // not have the library 'package:ccc/c2.dart', this means that this library
+    // does not exist in 'ccc' at all.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(3));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'B',
+          expectedTypeNameUri: 'package:bbb/b.dart');
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      _assertHasLinkedVariable(linkedPackage, 'b1', 'int',
+          expectedTypeNameUri: 'dart:core');
+      _assertHasLinkedVariable(linkedPackage, 'b2', 'C2',
+          expectedToBeResolved: false);
+    }
+
+    // package:ccc
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'ccc');
+      _assertHasLinkedVariable(linkedPackage, 'c', 'int',
+          expectedTypeNameUri: 'dart:core');
+    }
+  }
+
+  test_getLinkedBundles_noCycle() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+class A {}
+int a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+import 'package:aaa/a.dart';
+A b;
+''');
+
+    // 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.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(2));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'int',
+          expectedTypeNameUri: 'dart:core');
+    }
+
+    // package:bbb
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'bbb');
+      _assertHasLinkedVariable(linkedPackage, 'b', 'A',
+          expectedTypeNameUri: 'package:aaa/a.dart');
+    }
+  }
+
+  test_getLinkedBundles_noCycle_relativeUri() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'src/a2.dart';
+A a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/src/a2.dart',
+        '''
+class A {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Link.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(1));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'A',
+          expectedTypeNameUri: 'src/a2.dart');
+    }
+  }
+
+  test_getLinkedBundles_noCycle_withExport() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'package:bbb/b.dart';
+C a;
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+export 'package:ccc/c.dart';
+''');
+    resourceProvider.newFile(
+        '$CACHE/ccc/lib/c.dart',
+        '''
+class C {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    Folder libFolderC = resourceProvider.newFolder('$CACHE/ccc/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+        'ccc': [libFolderC],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Now we should be able to get linked bundles.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(3));
+
+    // package:aaa
+    {
+      LinkedPubPackage linkedPackage = linkedPackages
+          .singleWhere((linkedPackage) => linkedPackage.package.name == 'aaa');
+      _assertHasLinkedVariable(linkedPackage, 'a', 'C',
+          expectedTypeNameUri: 'package:ccc/c.dart');
+    }
+  }
+
+  test_getLinkedBundles_wrongScheme() async {
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+import 'xxx:yyy/zzz.dart';
+int a1;
+Z a2;
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder('$CACHE/aaa/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+      })
+    ]);
+
+    // Ensure unlinked bundles.
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+
+    // Try to link.
+    // The package 'aaa' is not linked.
+    // We don't know how to handle the URI scheme 'xxx'.
+    List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+    expect(linkedPackages, hasLength(0));
+  }
+
+  test_getPackageName() {
+    String getPackageName(String uriStr) {
+      return PubSummaryManager.getPackageName(uriStr);
+    }
+
+    expect(getPackageName('package:foo/bar.dart'), 'foo');
+    expect(getPackageName('package:foo/bar/baz.dart'), 'foo');
+    expect(getPackageName('wrong:foo/bar.dart'), isNull);
+    expect(getPackageName('package:foo'), isNull);
+  }
+
+  test_getUnlinkedBundles() async {
+    // Create package files.
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+class A {}
+''');
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/src/a2.dart',
+        '''
+class A2 {}
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+class B {}
+''');
+
+    // 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],
+      })
+    ]);
+
+    // No unlinked bundles yet.
+    {
+      Map<PubPackage, PackageBundle> bundles =
+          manager.getUnlinkedBundles(context);
+      expect(bundles, isEmpty);
+    }
+
+    // The requested unlinked bundles must be available after the wait.
+    await manager.onUnlinkedComplete;
+    {
+      Map<PubPackage, PackageBundle> bundles =
+          manager.getUnlinkedBundles(context);
+      expect(bundles, hasLength(2));
+      {
+        PackageBundle bundle = _getBundleByPackageName(bundles, 'aaa');
+        expect(bundle.linkedLibraryUris, isEmpty);
+        expect(bundle.unlinkedUnitUris,
+            ['package:aaa/a.dart', 'package:aaa/src/a2.dart']);
+        expect(bundle.unlinkedUnits, hasLength(2));
+        expect(bundle.unlinkedUnits[0].classes.map((c) => c.name), ['A']);
+        expect(bundle.unlinkedUnits[1].classes.map((c) => c.name), ['A2']);
+      }
+      {
+        PackageBundle bundle = _getBundleByPackageName(bundles, 'bbb');
+        expect(bundle.linkedLibraryUris, isEmpty);
+        expect(bundle.unlinkedUnitUris, ['package:bbb/b.dart']);
+        expect(bundle.unlinkedUnits, hasLength(1));
+        expect(bundle.unlinkedUnits[0].classes.map((c) => c.name), ['B']);
+      }
+    }
+
+    // The files must be created.
+    _assertFileExists(libFolderA.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderA.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+  }
+
+  test_getUnlinkedBundles_inconsistent_majorVersion() async {
+    // Create package files.
+    resourceProvider.newFile(
+        '$CACHE/aaa/lib/a.dart',
+        '''
+class A {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolder = resourceProvider.newFolder('$CACHE/aaa/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolder],
+      })
+    ]);
+
+    /**
+     * Verify that the [manager] has exactly one cache bundle `aaa`.
+     */
+    void _assertSingleBundle() {
+      Map<PubPackage, PackageBundle> bundles =
+          manager.getUnlinkedBundles(context);
+      expect(bundles, hasLength(1));
+      PackageBundle bundle = _getBundleByPackageName(bundles, 'aaa');
+      expect(bundle.unlinkedUnitUris, ['package:aaa/a.dart']);
+    }
+
+    // Compute the bundle using a non-default major version.
+    _createManager(majorVersion: 12345);
+    manager.getUnlinkedBundles(context);
+    await manager.onUnlinkedComplete;
+    _assertSingleBundle();
+
+    // Recompute when using the default major version.
+    _createManager();
+    expect(manager.getUnlinkedBundles(context), isEmpty);
+
+    // Wait for the bundle to be computed.
+    await manager.onUnlinkedComplete;
+    _assertSingleBundle();
+    _assertFileExists(libFolder.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolder.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+
+    // Can read from the file again.
+    _createManager();
+    _assertSingleBundle();
+  }
+
+  test_getUnlinkedBundles_notPubCache_dontCreate() async {
+    String aaaPath = '/Users/user/projects/aaa';
+    // Create package files.
+    resourceProvider.newFile(
+        '$aaaPath/lib/a.dart',
+        '''
+class A {}
+''');
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+class B {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.getFolder('$aaaPath/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    // No unlinked bundles initially.
+    {
+      Map<PubPackage, PackageBundle> bundles =
+          manager.getUnlinkedBundles(context);
+      expect(bundles, isEmpty);
+    }
+
+    // Wait for unlinked bundles to be computed.
+    await manager.onUnlinkedComplete;
+    Map<PubPackage, PackageBundle> bundles =
+        manager.getUnlinkedBundles(context);
+    // We have just one bundle - for 'bbb'.
+    expect(bundles, hasLength(1));
+    // We computed the unlinked bundle for 'bbb'.
+    {
+      PackageBundle bundle = _getBundleByPackageName(bundles, 'bbb');
+      expect(bundle.linkedLibraryUris, isEmpty);
+      expect(bundle.unlinkedUnitUris, ['package:bbb/b.dart']);
+      expect(bundle.unlinkedUnits, hasLength(1));
+      expect(bundle.unlinkedUnits[0].classes.map((c) => c.name), ['B']);
+    }
+
+    // The files must be created.
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+  }
+
+  test_getUnlinkedBundles_notPubCache_useExisting() async {
+    String aaaPath = '/Users/user/projects/aaa';
+    // Create package files.
+    {
+      File file = resourceProvider.newFile(
+          '$aaaPath/lib/a.dart',
+          '''
+class A {}
+''');
+      PackageBundleAssembler assembler = new PackageBundleAssembler()
+        ..addUnlinkedUnit(
+            file.createSource(FastUri.parse('package:aaa/a.dart')),
+            new UnlinkedUnitBuilder());
+      resourceProvider.newFileWithBytes(
+          '$aaaPath/${PubSummaryManager.UNLINKED_SPEC_NAME}',
+          assembler.assemble().toBuffer());
+    }
+    resourceProvider.newFile(
+        '$CACHE/bbb/lib/b.dart',
+        '''
+class B {}
+''');
+
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.getFolder('$aaaPath/lib');
+    Folder libFolderB = resourceProvider.newFolder('$CACHE/bbb/lib');
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+        'bbb': [libFolderB],
+      })
+    ]);
+
+    // Request already available unlinked bundles.
+    {
+      Map<PubPackage, PackageBundle> bundles =
+          manager.getUnlinkedBundles(context);
+      expect(bundles, hasLength(1));
+      // We get the unlinked bundle for 'aaa' because it already exists.
+      {
+        PackageBundle bundle = _getBundleByPackageName(bundles, 'aaa');
+        expect(bundle, isNotNull);
+      }
+    }
+
+    // Wait for unlinked bundles to be computed.
+    await manager.onUnlinkedComplete;
+    Map<PubPackage, PackageBundle> bundles =
+        manager.getUnlinkedBundles(context);
+    expect(bundles, hasLength(2));
+    // We still have the unlinked bundle for 'aaa'.
+    {
+      PackageBundle bundle = _getBundleByPackageName(bundles, 'aaa');
+      expect(bundle, isNotNull);
+    }
+    // We computed the unlinked bundle for 'bbb'.
+    {
+      PackageBundle bundle = _getBundleByPackageName(bundles, 'bbb');
+      expect(bundle.linkedLibraryUris, isEmpty);
+      expect(bundle.unlinkedUnitUris, ['package:bbb/b.dart']);
+      expect(bundle.unlinkedUnits, hasLength(1));
+      expect(bundle.unlinkedUnits[0].classes.map((c) => c.name), ['B']);
+    }
+
+    // The files must be created.
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_NAME);
+    _assertFileExists(libFolderB.parent, PubSummaryManager.UNLINKED_SPEC_NAME);
+  }
+
+  test_getUnlinkedBundles_notPubCache_useExisting_inconsistent() async {
+    String aaaPath = '/Users/user/projects/aaa';
+    // Create package files.
+    resourceProvider.newFile(
+        '$aaaPath/lib/a.dart',
+        '''
+class A {}
+''');
+
+    // Compute the bundles.
+    Folder libFolderA = resourceProvider.getFolder('$aaaPath/lib');
+    await new PubSummaryManager(resourceProvider, '_.temp')
+        .computeUnlinkedForFolder('aaa', libFolderA);
+
+    // Configure packages resolution.
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+      })
+    ]);
+
+    // Request already available unlinked bundles.
+    expect(manager.getUnlinkedBundles(context), hasLength(1));
+
+    // Update a Dart file.
+    // So, the cached bundle cannot be reused.
+    resourceProvider.updateFile(
+        '$aaaPath/lib/a.dart',
+        '''
+class A2 {}
+''');
+    _createManager();
+    expect(manager.getUnlinkedBundles(context), isEmpty);
+
+    // ...and because it is not in the pub cache, it will not be recomputed.
+    await manager.onUnlinkedComplete;
+    expect(manager.getUnlinkedBundles(context), isEmpty);
+  }
+
+  test_getUnlinkedBundles_nullPackageMap() async {
+    context.sourceFactory =
+        new SourceFactory(<UriResolver>[sdkResolver, resourceResolver]);
+    Map<PubPackage, PackageBundle> bundles =
+        manager.getUnlinkedBundles(context);
+    expect(bundles, isEmpty);
+  }
+
+  test_isPathInPubCache_posix() {
+    expect(
+        PubSummaryManager.isPathInPubCache(pathos.posix,
+            '/home/.pub-cache/hosted/pub.dartlang.org/foo/lib/bar.dart'),
+        isTrue);
+    expect(
+        PubSummaryManager.isPathInPubCache(
+            pathos.posix, '/home/.pub-cache/foo/lib/bar.dart'),
+        isTrue);
+    expect(
+        PubSummaryManager.isPathInPubCache(
+            pathos.posix, '/home/sources/dart/foo/lib/bar.dart'),
+        isFalse);
+  }
+
+  test_isPathInPubCache_windows() {
+    expect(
+        PubSummaryManager.isPathInPubCache(pathos.windows,
+            r'C:\Users\user\Setters\Pub\Cache\hosted\foo\lib\bar.dart'),
+        isTrue);
+    expect(
+        PubSummaryManager.isPathInPubCache(
+            pathos.windows, r'C:\Users\user\Sources\Dart\foo\lib\bar.dart'),
+        isFalse);
+  }
+
+  void _assertFileExists(Folder folder, String fileName) {
+    expect(folder.getChildAssumingFile(fileName).exists, isTrue);
+  }
+
+  void _assertHasLinkedVariable(LinkedPubPackage linkedPackage,
+      String variableName, String expectedTypeName,
+      {bool expectedToBeResolved: true,
+      String expectedTypeNameUri: 'shouldBeSpecifiedIfResolved'}) {
+    PackageBundle unlinked = linkedPackage.unlinked;
+    PackageBundle linked = linkedPackage.linked;
+    expect(unlinked, isNotNull);
+    expect(linked, isNotNull);
+    for (int i = 0; i < unlinked.unlinkedUnitUris.length; i++) {
+      String unlinkedUnitUri = unlinked.unlinkedUnitUris[i];
+      UnlinkedUnit unlinkedUnit = unlinked.unlinkedUnits[i];
+      for (UnlinkedVariable v in unlinkedUnit.variables) {
+        if (v.name == variableName) {
+          int typeNameReference = v.type.reference;
+          expect(unlinkedUnit.references[typeNameReference].name,
+              expectedTypeName);
+          for (int j = 0; j < linked.linkedLibraryUris.length; j++) {
+            String linkedLibraryUri = linked.linkedLibraryUris[j];
+            if (linkedLibraryUri == unlinkedUnitUri) {
+              LinkedLibrary linkedLibrary = linked.linkedLibraries[j];
+              LinkedUnit linkedUnit = linkedLibrary.units.single;
+              int typeNameDependency =
+                  linkedUnit.references[typeNameReference].dependency;
+              if (expectedToBeResolved) {
+                expect(linkedLibrary.dependencies[typeNameDependency].uri,
+                    expectedTypeNameUri);
+              } else {
+                expect(typeNameDependency, isZero);
+              }
+              return;
+            }
+          }
+          fail('Cannot find linked unit for $variableName in $linkedPackage');
+        }
+      }
+    }
+    fail('Cannot find variable $variableName in $linkedPackage');
+  }
+
+  void _createManager(
+      {bool allowLinking: true,
+      int majorVersion: PackageBundleAssembler.currentMajorVersion}) {
+    manager = new PubSummaryManager(resourceProvider, '_.temp',
+        allowLinking: allowLinking, majorVersion: majorVersion);
+  }
+
+  LinkedPubPackage _getLinkedPackage(
+      List<LinkedPubPackage> packages, String name) {
+    return packages
+        .singleWhere((linkedPackage) => linkedPackage.package.name == name);
+  }
+
+  _testImpl_getLinkedBundles_cached_declaredVariables(
+      String importOrExport) async {
+    String pathA = '$CACHE/aaa/lib';
+    resourceProvider.newFile('$pathA/foo.dart', 'class A {}');
+    resourceProvider.newFile('$pathA/foo_io.dart', 'class A {}');
+    resourceProvider.newFile('$pathA/foo_html.dart', 'class A {}');
+    resourceProvider.newFile(
+        '$pathA/user.dart',
+        '''
+$importOrExport 'foo.dart'
+  if (dart.library.io) 'foo_io.dart'
+  if (dart.library.html) 'foo_html.dart';
+''');
+    // Configure packages resolution.
+    Folder libFolderA = resourceProvider.newFolder(pathA);
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      sdkResolver,
+      resourceResolver,
+      new PackageMapUriResolver(resourceProvider, {
+        'aaa': [libFolderA],
+      })
+    ]);
+
+    void _assertDependencyInUser(PackageBundle bundle, String shortName) {
+      for (var i = 0; i < bundle.linkedLibraryUris.length; i++) {
+        if (bundle.linkedLibraryUris[i].endsWith('user.dart')) {
+          LinkedLibrary library = bundle.linkedLibraries[i];
+          expect(library.dependencies.map((d) => d.uri),
+              unorderedEquals(['', 'dart:core', shortName]));
+          return;
+        }
+      }
+      fail('Not found user.dart in $bundle');
+    }
+
+    // Session 1.
+    // Create the linked bundle and cache it in a file.
+    {
+      // Ensure unlinked bundles.
+      manager.getUnlinkedBundles(context);
+      await manager.onUnlinkedComplete;
+
+      // Now we should be able to get the linked bundle.
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(1));
+    }
+
+    // Session 2.
+    // Recreate manager and don't allow it to perform new linking.
+    // Set a declared variable, which is not used in the package.
+    // We still can get the cached linked bundle.
+    {
+      context.declaredVariables.define('not.used.variable', 'baz');
+      _createManager(allowLinking: false);
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(1));
+      _assertDependencyInUser(linkedPackages.single.linked, 'foo.dart');
+    }
+
+    // Session 3.
+    // Recreate manager and don't allow it to perform new linking.
+    // Set the value of a referenced declared variable.
+    // So, we cannot use the previously cached linked bundle.
+    {
+      context.declaredVariables.define('dart.library.io', 'does-not-matter');
+      _createManager(allowLinking: false);
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, isEmpty);
+    }
+
+    // Session 4.
+    // Enable new linking, and configure to use 'foo_html.dart'.
+    {
+      context.declaredVariables.define('dart.library.html', 'true');
+      _createManager();
+      List<LinkedPubPackage> linkedPackages = manager.getLinkedBundles(context);
+      expect(linkedPackages, hasLength(1));
+      _assertDependencyInUser(linkedPackages.single.linked, 'foo_html.dart');
+    }
+  }
+
+  static PackageBundle _getBundleByPackageName(
+      Map<PubPackage, PackageBundle> bundles, String name) {
+    PubPackage package =
+        bundles.keys.singleWhere((package) => package.name == name);
+    return bundles[package];
+  }
+}