def METHOD_NAME(self):
    super().METHOD_NAME()
    self.testfilename = self.get_local_path('nix/nixio_fr.nix')
    self.reader_fr = NixIOfr(filename=self.testfilename)
    self.reader_norm = NixIO(filename=self.testfilename, mode='ro')
    self.blk = self.reader_fr.read_block(block_index=1, load_waveforms=True)
    # read block with NixIOfr
    self.blk1 = self.reader_norm.read_block(index=1)  # read same block with NixIO