def adata_parameterized(request):
    return gen_adata(shape=(200, 300), X_type=request.param)
def files(self):
        """Explicitly listed files or patterns or roots:
        if no patterns or .always(): empty list,
        if exact: list exact files,
        if not .anypats(): list all files and dirs,
        else: optimal roots"""
        return self._files