def test_iterator_metadata(self):
    src_strings_array = [
        ['gs://bucket1'],
        ['source'],
        ['s3://bucket1']
    ]
    dst_strings = ['gs://bucket2', 'dest', 'gs://bucket2']

    copy_objects_iterator = CopyObjectsIterator(
        _ConstrcutNameExpansionIteratorDestinationTupleIterator(
            src_strings_array, dst_strings),
        False)

    self.assertFalse(copy_objects_iterator.has_cloud_src)
    self.assertFalse(copy_objects_iterator.has_file_src)
    self.assertEquals(len(copy_objects_iterator.provider_types), 0)

    next(copy_objects_iterator)
    self.assertTrue(copy_objects_iterator.has_cloud_src)
    self.assertFalse(copy_objects_iterator.has_file_src)
    self.assertEquals(len(copy_objects_iterator.provider_types), 1)
    self.assertTrue('gs' in copy_objects_iterator.provider_types)

    next(copy_objects_iterator)
    self.assertTrue(copy_objects_iterator.has_cloud_src)
    self.assertTrue(copy_objects_iterator.has_file_src)
    self.assertEquals(len(copy_objects_iterator.provider_types), 2)
    self.assertTrue('file' in copy_objects_iterator.provider_types)
    self.assertFalse(copy_objects_iterator.is_daisy_chain)

    next(copy_objects_iterator)
    self.assertEquals(len(copy_objects_iterator.provider_types), 3)
    self.assertTrue('s3' in copy_objects_iterator.provider_types)
    self.assertTrue(copy_objects_iterator.is_daisy_chain)
  def test_iterator(self):
    src_strings_array = [
        ['src_{}_{}'.format(i, j) for j in range(4)] for i in range(3)
    ]
    dst_strings = ['dest_' + str(i) for i in range(3)]

    copy_objects_iterator = CopyObjectsIterator(
        _ConstrcutNameExpansionIteratorDestinationTupleIterator(
            src_strings_array, dst_strings),
        False)

    # Flatten the src dst arrays
    src_dst_strings = [
        (src, dst) for src_strings, dst in zip(src_strings_array, dst_strings)
        for src in src_strings
    ]

    for (src_string, dst_string) in src_dst_strings:
      copy_object_info = next(copy_objects_iterator)
      self.assertEquals(src_string,
                        copy_object_info.source_storage_url.object_name)
      self.assertEquals(dst_string, copy_object_info.exp_dst_url.object_name)

    iterator_ended = False
    try:
      next(copy_objects_iterator)
    except StopIteration:
      iterator_ended = True

    self.assertTrue(iterator_ended)