45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
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"""Tests for utils.atomic_yaml_write — crash-safe YAML file writes."""
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from pathlib import Path
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from unittest.mock import patch
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import pytest
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import yaml
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from utils import atomic_yaml_write
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class TestAtomicYamlWrite:
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def test_writes_valid_yaml(self, tmp_path):
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target = tmp_path / "data.yaml"
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data = {"key": "value", "nested": {"a": 1}}
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atomic_yaml_write(target, data)
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assert yaml.safe_load(target.read_text(encoding="utf-8")) == data
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def test_cleans_up_temp_file_on_baseexception(self, tmp_path):
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class SimulatedAbort(BaseException):
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pass
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target = tmp_path / "data.yaml"
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original = {"preserved": True}
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target.write_text(yaml.safe_dump(original), encoding="utf-8")
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with patch("utils.yaml.dump", side_effect=SimulatedAbort):
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with pytest.raises(SimulatedAbort):
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atomic_yaml_write(target, {"new": True})
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tmp_files = [f for f in tmp_path.iterdir() if ".tmp" in f.name]
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assert len(tmp_files) == 0
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assert yaml.safe_load(target.read_text(encoding="utf-8")) == original
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def test_appends_extra_content(self, tmp_path):
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target = tmp_path / "data.yaml"
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atomic_yaml_write(target, {"key": "value"}, extra_content="\n# comment\n")
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text = target.read_text(encoding="utf-8")
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assert "key: value" in text
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assert "# comment" in text
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