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nesquena-hermes
683a96acda
Adds the test the project's contribution rules require for non-trivial logic (AGENTS.md). Covers: posix passthrough (1 call, no sleep), Windows retry-then-succeed, reraise after exhausting 5 attempts (no silent success on a save path), no-retry on non-PermissionError, and the 50/100/200/400ms backoff sequence. Production _safe_replace unchanged.
62 lines
2.3 KiB
Python
62 lines
2.3 KiB
Python
# tests/test_issue5196_windows_safe_replace.py
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from unittest import mock
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from api import models
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def test_safe_replace_passthrough_off_windows():
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calls = []
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with mock.patch.object(models.os, "name", "posix"), \
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mock.patch.object(models.os, "replace", lambda s, d: calls.append((s, d))), \
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mock.patch.object(models.time, "sleep") as slept:
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models._safe_replace("a", "b")
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assert len(calls) == 1 and not slept.called
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def test_safe_replace_retries_then_succeeds_on_windows():
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n = {"c": 0}
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def flaky(s, d):
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n["c"] += 1
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if n["c"] <= 2:
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raise PermissionError("WinError 5")
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with mock.patch.object(models.os, "name", "nt"), \
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mock.patch.object(models.os, "replace", flaky), \
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mock.patch.object(models.time, "sleep", lambda x: None):
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models._safe_replace("a", "b")
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assert n["c"] == 3
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def test_safe_replace_reraises_after_exhausting_retries():
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n = {"c": 0}
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def always(s, d):
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n["c"] += 1
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raise PermissionError("WinError 5")
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with mock.patch.object(models.os, "name", "nt"), \
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mock.patch.object(models.os, "replace", always), \
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mock.patch.object(models.time, "sleep", lambda x: None):
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import pytest
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with pytest.raises(PermissionError):
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models._safe_replace("a", "b")
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assert n["c"] == 5 # no silent success on a save path
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def test_safe_replace_does_not_retry_non_permission_errors():
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n = {"c": 0}
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def oserr(s, d):
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n["c"] += 1
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raise OSError("disk full")
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with mock.patch.object(models.os, "name", "nt"), \
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mock.patch.object(models.os, "replace", oserr), \
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mock.patch.object(models.time, "sleep", lambda x: None):
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import pytest
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with pytest.raises(OSError):
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models._safe_replace("a", "b")
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assert n["c"] == 1
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def test_safe_replace_backoff_sequence():
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delays = []
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def always(s, d):
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raise PermissionError("x")
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with mock.patch.object(models.os, "name", "nt"), \
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mock.patch.object(models.os, "replace", always), \
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mock.patch.object(models.time, "sleep", lambda x: delays.append(round(x, 3))):
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import pytest
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with pytest.raises(PermissionError):
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models._safe_replace("a", "b")
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assert delays == [0.05, 0.1, 0.2, 0.4]
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