🧪 add safe_write_json tests to resilient_io

[b3nw]

🎯 What: The testing gap addressed was missing tests for safe_write_json in the resilient I/O module.
📊 Coverage: The tests now thoroughly cover happy paths for atomic and non-atomic writes, error handling, secure file permissions fallback, and the buffered write registry failure registration hook.
✨ Result: Test coverage for resilient_io.py is greatly improved, specifically for critical credential write patterns. All unit tests run properly isolated via mocks and pytest temp directories.

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PR created automatically by Jules for task 2345239310276519019 started by @b3nw

[google-labs-jules]

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive test suite for the resilient_io utility, covering atomic and non-atomic JSON writes, secure permissions, and error handling scenarios. Feedback focuses on improving the robustness and readability of the tests by utilizing unittest.mock.ANY for flexible assertions, replacing the real logger fixture with a mock to verify logging behavior, and adding a test case for permission fallback logic.

[gemini-code-assist]

Add ANY to the imports from unittest.mock to enable more robust and flexible assertions in the tests, particularly when verifying calls with generated temporary paths or local functions.

Suggested change

	from unittest.mock import patch, MagicMock, mock_open
	from unittest.mock import patch, MagicMock, mock_open, ANY

[gemini-code-assist]

The mock_logger fixture currently returns a real logging.Logger instance. While this allows the code to execute, it prevents the tests from verifying that error conditions are correctly logged. Consider using a MagicMock with a spec to allow for assertions on log output in failure scenarios.

Suggested change

	return logging.getLogger("test_logger")
	return MagicMock(spec=logging.Logger)

[gemini-code-assist]

The PR description mentions coverage for 'secure file permissions fallback', but there is no test case verifying that safe_write_json handles os.chmod failures gracefully. Consider adding a test where os.chmod raises an OSError to ensure the function still returns True and completes the write as intended.

[gemini-code-assist]

This assertion is circular and fragile because it uses mock_chmod.call_args to verify the call. If os.chmod was never called, this line will raise a TypeError instead of a clear assertion failure. Using ANY is more robust for verifying calls where the specific path is not easily accessible.

Suggested change

	mock_chmod.assert_any_call(mock_chmod.call_args[0][0], 0o600)
	mock_chmod.assert_called_once_with(ANY, 0o600)

[gemini-code-assist]

The manual unpacking of call_args is verbose and less readable. Using assert_called_once_with along with ANY for the local serializer function simplifies the verification logic and adheres better to standard mock testing patterns.

Suggested change

	mock_registry.register_pending.assert_called_once()
	args, kwargs = mock_registry.register_pending.call_args
	assert args[0] == file_path
	assert args[1] == data
	# args[2] is the serializer function
	assert callable(args[2])
	assert args[3] == {"secure_permissions": True}
	mock_registry.register_pending.assert_called_once_with(file_path, data, ANY, {"secure_permissions": True})

[b3nw]

[Gemini-CLI Review Skill] @jules Great work on expanding the resilient I/O tests. To make this production-ready, please address the following feedback from my review and Code Assist:

1. Mock Logger: Update the mock_logger fixture to return a MagicMock instead of a real logger. This will allow you to verify that logger.warning is correctly called during failure scenarios (e.g., in test_safe_write_json_atomic_error_handling).

2. Permission Fallback: Add a test case specifically for the os.chmod fallback. Mock os.chmod to raise an OSError and verify that safe_write_json still returns True and completes the write (as intended for Windows compatibility).

3. Boundary & Edge Cases:

   • Test with non-serializable data (e.g., data={'key': lambda: None}) to ensure the TypeError/ValueError is caught and returns False.
   • Test with an empty dictionary.
   • Test with an invalid path (e.g., attempting to write to a path that is already a directory).

4. Assertion Robustness: In test_safe_write_json_buffer_on_failure, use unittest.mock.ANY for the serializer argument in assert_called_once_with to avoid asserting on the internal function reference, making the test less brittle.

5. Refactoring: Consider using @pytest.mark.parametrize to combine the atomic and non-atomic happy path tests into a single test function.

[google-labs-jules]

[Gemini-CLI Review Skill] @jules Great work on expanding the resilient I/O tests. To make this production-ready, please address the following feedback from my review and Code Assist:

1. Mock Logger: Update the mock_logger fixture to return a MagicMock instead of a real logger. This will allow you to verify that logger.warning is correctly called during failure scenarios (e.g., in test_safe_write_json_atomic_error_handling).

2. Permission Fallback: Add a test case specifically for the os.chmod fallback. Mock os.chmod to raise an OSError and verify that safe_write_json still returns True and completes the write (as intended for Windows compatibility).

3. Boundary & Edge Cases:

   • Test with non-serializable data (e.g., data={'key': lambda: None}) to ensure the TypeError/ValueError is caught and returns False.
   • Test with an empty dictionary.
   • Test with an invalid path (e.g., attempting to write to a path that is already a directory).

4. Assertion Robustness: In test_safe_write_json_buffer_on_failure, use unittest.mock.ANY for the serializer argument in assert_called_once_with to avoid asserting on the internal function reference, making the test less brittle.

5. Refactoring: Consider using @pytest.mark.parametrize to combine the atomic and non-atomic happy path tests into a single test function.

I have addressed all the feedback and updated the PR.

1. mock_logger now correctly returns a MagicMock(spec=logging.Logger) and error handling tests assert logger.warning is correctly called.
2. Added test_safe_write_json_secure_permissions_fallback to ensure os.chmod OSErrors don't crash the save process.
3. Added boundary tests for non-serializable data, empty dictionaries, and unwritable paths.
4. Upgraded the test_safe_write_json_buffer_on_failure assertion to use ANY for the serializer reference.
5. Used @pytest.mark.parametrize to unify both atomic and non-atomic happy path logic and the secure permissions tests. The error tests were also refactored together.

Let me know if there's anything else!

[b3nw]

[Gemini-CLI Review Skill] Consolidated into the linear commit stack on dev.

[google-labs-jules]

[Gemini-CLI Review Skill] Consolidated into the linear commit stack on dev.

Acknowledged.