| # |
| # 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. |
| # |
| import os |
| import pytest |
| |
| from buildstream.utils import save_file_atomic |
| |
| |
| def test_save_new_file(tmpdir): |
| filename = os.path.join(str(tmpdir), "savefile-success.test") |
| with save_file_atomic(filename, "w") as f: |
| f.write("foo\n") |
| |
| assert os.listdir(str(tmpdir)) == ["savefile-success.test"] |
| with open(filename, encoding="utf-8") as f: |
| assert f.read() == "foo\n" |
| |
| |
| def test_save_over_existing_file(tmpdir): |
| filename = os.path.join(str(tmpdir), "savefile-overwrite.test") |
| |
| with open(filename, "w", encoding="utf-8") as f: |
| f.write("existing contents\n") |
| |
| with save_file_atomic(filename, "w") as f: |
| f.write("overwritten contents\n") |
| |
| assert os.listdir(str(tmpdir)) == ["savefile-overwrite.test"] |
| with open(filename, encoding="utf-8") as f: |
| assert f.read() == "overwritten contents\n" |
| |
| |
| def test_exception_new_file(tmpdir): |
| filename = os.path.join(str(tmpdir), "savefile-exception.test") |
| |
| with pytest.raises(RuntimeError): |
| with save_file_atomic(filename, "w") as f: |
| f.write("Some junk\n") |
| raise RuntimeError("Something goes wrong") |
| |
| assert os.listdir(str(tmpdir)) == [] |
| |
| |
| def test_exception_existing_file(tmpdir): |
| filename = os.path.join(str(tmpdir), "savefile-existing.test") |
| |
| with open(filename, "w", encoding="utf-8") as f: |
| f.write("existing contents\n") |
| |
| with pytest.raises(RuntimeError): |
| with save_file_atomic(filename, "w") as f: |
| f.write("Some junk\n") |
| raise RuntimeError("Something goes wrong") |
| |
| assert os.listdir(str(tmpdir)) == ["savefile-existing.test"] |
| with open(filename, encoding="utf-8") as f: |
| assert f.read() == "existing contents\n" |
| |
| |
| def test_attributes(tmpdir): |
| filename = os.path.join(str(tmpdir), "savefile-attributes.test") |
| with save_file_atomic(filename, "w") as f: |
| assert f.real_filename == filename |
| assert f.name != filename |