# GT4Py - GridTools Framework
#
# Copyright (c) 2014-2023, ETH Zurich
# All rights reserved.
#
# This file is part of the GT4Py project and the GridTools framework.
# GT4Py is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or any later
# version. See the LICENSE.txt file at the top-level directory of this
# distribution for a copy of the license or check <https://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: GPL-3.0-or-later

from gt4py.next.iterator import ir
from gt4py.next.iterator.transforms.eta_reduction import EtaReduction


def test_simple():
    testee = ir.Lambda(
        params=[ir.Sym(id="x")],
        expr=ir.FunCall(fun=ir.SymRef(id="deref"), args=[ir.SymRef(id="x")]),
    )
    expected = ir.SymRef(id="deref")
    actual = EtaReduction().visit(testee)
    assert actual == expected
