def METHOD_NAME(self, filename):
    """Test basic init with no extra parameters."""
    from satpy.readers import load_reader
    r = load_reader(self.reader_configs)
    loadables = r.select_files_from_pathnames([filename])
    assert len(loadables) == 1
    r.create_filehandlers(loadables)
    # make sure we have some files
    assert r.file_handlers