anchor.diff:  
     @failingTest
     test_file_importedLibrary_package() async {
  +    fail('Not yet implemented/tested');
       // configure packages
       testFile = '/packages/my_pkg/lib/aaa/test.dart';
       newFile(testFile, content: '');
  
positive.code: 
    @failingTest
    test_file_importedLibrary_down() async {
      String pathA = '/project/000/1111/a.dart';
      testFile = '/project/000/1111/test.dart';
      addSource(pathA, '''
  
negative.code: 
    @failingTest
    test_file_importedLibrary_sideways() async {
      fail('Not yet implemented/tested');
      String pathA = '/project/000/1111/a.dart';
      testFile = '/project/000/1111/sub/folder/test.dart';
      addSource(pathA, '''
  