test_atomic_writes.py
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| 1 | """Data-integrity tests for atomic per-file writes.""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from pathlib import Path |
| 6 | |
| 7 | from tests.support import run_cli |
| 8 | |
| 9 | |
| 10 | def test_no_half_written_file_on_failure(tmp_path: Path) -> None: |
| 11 | run_cli(["init", "--regime", "git-only", "--non-interactive"], cwd=tmp_path) |
| 12 | target = tmp_path / "docs" / "OVERSEER-HANDOVER.md" |
| 13 | original = target.read_bytes() |
| 14 | |
| 15 | from unittest.mock import patch |
| 16 | |
| 17 | with patch("cli.atomic.os.replace", side_effect=OSError("boom")): |
| 18 | run_cli( |
| 19 | ["init", "--regime", "git-only", "--non-interactive", "--force"], |
| 20 | cwd=tmp_path, |
| 21 | ) |
| 22 | |
| 23 | assert not list(target.parent.glob(".*.overseer.tmp")) |
| 24 | assert target.read_bytes() == original |