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# Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from unittest.mock import patch
import pytest
from nemo.utils.file_utils import robust_copy
class TestRobustCopy:
@pytest.mark.unit
def test_robust_copy_success(self, tmp_path):
"""Tests that robust_copy uses shutil.copy2 and does not fall back."""
src_file = tmp_path / "source.txt"
src_file.write_text("test content")
dest_file = tmp_path / "dest.txt"
with (
patch('nemo.utils.file_utils.shutil.copy2') as mock_copy2,
patch('nemo.utils.file_utils.shutil.copy') as mock_copy,
):
robust_copy(src_file, dest_file)
mock_copy2.assert_called_once_with(src_file, dest_file)
mock_copy.assert_not_called()
@pytest.mark.unit
def test_robust_copy_fallback(self, tmp_path):
"""Tests that robust_copy falls back to shutil.copy if shutil.copy2 fails."""
src_file = tmp_path / "source.txt"
src_file.write_text("test content")
dest_file = tmp_path / "dest.txt"
with (
patch('nemo.utils.file_utils.shutil.copy2', side_effect=PermissionError("copy2 fails")) as mock_copy2,
patch('nemo.utils.file_utils.shutil.copy') as mock_copy,
):
robust_copy(src_file, dest_file)
mock_copy2.assert_called_once_with(src_file, dest_file)
mock_copy.assert_called_once_with(src_file, dest_file)
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