| # 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 |