def METHOD_NAME(self):
    # TODO problematic interface design: should be able to use Orange.data.Table directly
    path = os.path.join(get_sample_datasets_dir(), AGILENT_TILE)
    reader = OWTilefile.get_tile_reader(path)
    pp = PreprocessorList(PREPROCESSORS_INDEPENDENT_SAMPLES[0:7])
    reader.set_preprocessor(pp)
    t = reader.read()
    assert len(t.domain.attributes) == 3