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# Copyright 2020 Google LLC
#
# 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.
"""Contains convenient helpers for writing tests."""
import contextlib
import os
import shutil
import tempfile
from unittest import mock
def patch_environ(testcase_obj, env=None):
"""Patch environment."""
if env is None:
env = {}
patcher = mock.patch.dict(os.environ, env)
testcase_obj.addCleanup(patcher.stop)
patcher.start()
@contextlib.contextmanager
def temp_dir_copy(directory):
"""Context manager that yields a temporary copy of |directory|."""
with tempfile.TemporaryDirectory() as temp_dir:
temp_copy_path = os.path.join(temp_dir, os.path.basename(directory))
shutil.copytree(directory, temp_copy_path)
yield temp_copy_path
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