Resolve type hierarchies for all units of the library's import closure.

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/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 1308 matching lines @@
     LibraryElement library = outputs[LIBRARY_ELEMENT5];
     {
       ClassElement classB = library.getType('B');
       expect(classB.supertype.displayName, 'A');
     }
     {
       ClassElement classC = library.getType('C');
       expect(classC.supertype.displayName, 'A');
     }
   }
+
+  test_perform_deep() {
+    Source sourceA = _newSource('/a.dart', '''
+library a;
+import 'b.dart';
+class A extends B {}
+''');
+    _newSource('/b.dart', '''
+library b;
+import 'c.dart';
+part 'b2.dart';
+class B extends B2 {}
+''');
+    _newSource('/b2.dart', '''
+part of b;
+class B2 extends C {}
+''');
+    _newSource('/c.dart', '''
+library c;
+class C {}
+''');
+    _computeResult(sourceA, LIBRARY_ELEMENT5);
+    expect(task, new isInstanceOf<ResolveLibraryTypeNamesTask>());
+    // validate
+    LibraryElement library = outputs[LIBRARY_ELEMENT5];
+    {
+      ClassElement clazz = library.getType('A');
+      expect(clazz.displayName, 'A');
+      clazz = clazz.supertype.element;
+      expect(clazz.displayName, 'B');
+      clazz = clazz.supertype.element;
+      expect(clazz.displayName, 'B2');
+      clazz = clazz.supertype.element;
+      expect(clazz.displayName, 'C');
+      clazz = clazz.supertype.element;
+      expect(clazz.displayName, 'Object');
+      expect(clazz.supertype, isNull);
+    }
+  }
 }
 
 @reflectiveTest
 class ResolveReferencesTaskTest extends _AbstractDartTaskTest {
   test_perform() {
     Source source = _newSource('/test.dart', '''
 class A {
   m() {}
 }
 main(A a) {
@@ skipping 345 matching lines @@
     return entryMap.putIfAbsent(target, () => new CacheEntry());
   }
 
   TimestampedData<String> getContents(Source source) => source.contents;
 
   noSuchMethod(Invocation invocation) {
     print('noSuchMethod: ${invocation.memberName}');
     return super.noSuchMethod(invocation);
   }
 }