def get_dataset(filename, index_attr='bam_index', dataset_id=1, has_data=True):
dataset = Bunch()
dataset.has_data = lambda: True
dataset.id = dataset_id
dataset.metadata = Bunch()
with get_input_files(filename) as input_files, get_tmp_path() as index_path:
dataset.file_name = input_files[0]
index = Bunch()
index.file_name = index_path
setattr(dataset.metadata, index_attr, index)
yield dataset
