anchor.diff:  void main() {
     AnalyzerHelper helper = new AnalyzerHelper();
     String dirPath = p.join(Directory.current.path, 'test_package');
  -  List<LibraryElement> libElements = ['lib/example.dart', 'lib/two_exports.dart'].map((libFile) {
  +  List<LibraryElement> libElements = [
  +    'lib/example.dart',
  +    'lib/two_exports.dart'
  +  ].map((libFile) {
       Source source = helper.addSource(p.join(dirPath, libFile));
       return helper.resolve(source);
     });
  
positive.code:     Class extendedClass;
  
      setUp(() {
        twoExportsLib = package.libraries.firstWhere((lib) => lib.name == 'two_exports');
        assert(twoExportsLib != null);
        extendedClass = twoExportsLib.allClasses.firstWhere((clazz) => clazz.name == 'ExtendingClass');
      });
  
      test('references are correct', () {
  
negative.code:       expect(extendedClass, isNotNull);
        String resolved = extendedClass.resolveReferences();
        expect(resolved, isNotNull);
        expect(resolved,
            contains('<a href="two_exports/BaseClass_class.html">BaseClass</a>'));
      });
    });
  
  