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Added detailed technical review of PR #362.


PR created automatically by Jules for task 6034124287517004733 started by @chalmerlowe

This commit adds a detailed technical review of PR #362 to REVIEW.md,
covering functional correctness, adherence to Google Python standards,
and suggested refactors.

Co-authored-by: chalmerlowe <7291104+chalmerlowe@users.noreply.github.com>
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@product-auto-label product-auto-label bot added the size: m Pull request size is medium. label Jan 23, 2026
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Summary of Changes

Hello @chalmerlowe, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a detailed technical review of PR #362 for the google-auth-library-python-oauthlib repository. The review thoroughly assesses the original PR's changes, which aimed to enhance observability in headless environments by adding logging alongside print statements. It highlights a critical violation of Python logging best practices due to explicit logger level setting within the library and points out the absence of dedicated tests for the new logging behavior, providing clear recommendations for necessary revisions.

Highlights

  • Logging Best Practices Violation: The review identifies a critical issue in PR feat: Log the flow.run_local_server redirect URL #362 where the library explicitly sets the logger level (_LOGGER.setLevel(logging.INFO)), which violates Python logging best practices for libraries. Libraries should emit logs at appropriate levels and allow application developers to configure logging.
  • Insufficient Testing: PR feat: Log the flow.run_local_server redirect URL #362 lacks dedicated tests to verify the newly added logging functionality. The review provides a concrete example of a test case to add to tests/unit/test_flow.py.
  • Functional Correctness & Scope: The review confirms that PR feat: Log the flow.run_local_server redirect URL #362 correctly duplicates output to the logger in run_local_server for headless environments, addressing a valid use case. The scope of the change is deemed appropriate.
  • Suggested Refactors: Specific refactoring suggestions are provided, including removing the explicit logger level setting and adding a test case to validate log messages.
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Code Review

This pull request adds a detailed technical review for another pull request. The review itself is of high quality, identifying a critical issue with logging configuration and correctly suggesting a fix and the addition of tests. My feedback focuses on further improving the clarity of the suggested changes and enhancing the completeness of the proposed test case to ensure no regressions are introduced.

Comment on lines +43 to +50
```python
<<<<<<< SEARCH
_LOGGER = logging.getLogger(__name__)
_LOGGER.setLevel(logging.INFO)
=======
_LOGGER = logging.getLogger(__name__)
>>>>>>> REPLACE
```
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medium

The use of <<<<<<< SEARCH and >>>>>>> REPLACE is a bit unconventional for presenting code changes in a review document. For better readability and to adhere to a more standard format, consider using a diff code block. This makes it immediately clear what lines are being removed or added.

Suggested change
```python
<<<<<<< SEARCH
_LOGGER = logging.getLogger(__name__)
_LOGGER.setLevel(logging.INFO)
=======
_LOGGER = logging.getLogger(__name__)
>>>>>>> REPLACE
```
_LOGGER = logging.getLogger(__name__)
- _LOGGER.setLevel(logging.INFO)

Comment on lines +56 to +78
@mock.patch("google_auth_oauthlib.flow.webbrowser", autospec=True)
def test_run_local_server_logs_url(self, webbrowser_mock, instance, mock_fetch_token, port, caplog):
auth_redirect_url = urllib.parse.urljoin(
f"http://localhost:{port}", self.REDIRECT_REQUEST_PATH
)

# Configure caplog to capture INFO logs
caplog.set_level(logging.INFO, logger="google_auth_oauthlib.flow")

with concurrent.futures.ThreadPoolExecutor(max_workers=1) as pool:
future = pool.submit(partial(instance.run_local_server, port=port))

while not future.done():
try:
requests.get(auth_redirect_url)
except requests.ConnectionError:
pass

future.result()

# Verify log message
assert "Please visit this URL" in caplog.text
assert instance.redirect_uri in caplog.text
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medium

This is a great test case suggestion for verifying the new logging behavior. To make it even more robust and ensure no existing functionality is broken, consider also asserting that the original print functionality is preserved. This would guard against accidentally removing the console output for users who rely on it. You can achieve this by patching builtins.print, adding assertions for it, and renaming the test to reflect its more comprehensive nature.

    @mock.patch("builtins.print")
    @mock.patch("google_auth_oauthlib.flow.webbrowser", autospec=True)
    def test_run_local_server_logs_and_prints_url(self, print_mock, webbrowser_mock, instance, mock_fetch_token, port, caplog):
        auth_redirect_url = urllib.parse.urljoin(
            f"http://localhost:{port}", self.REDIRECT_REQUEST_PATH
        )

        # Configure caplog to capture INFO logs
        caplog.set_level(logging.INFO, logger="google_auth_oauthlib.flow")

        with concurrent.futures.ThreadPoolExecutor(max_workers=1) as pool:
            future = pool.submit(partial(instance.run_local_server, port=port))

            while not future.done():
                try:
                    requests.get(auth_redirect_url)
                except requests.ConnectionError:
                    pass

            future.result()

        # Verify log message
        assert "Please visit this URL" in caplog.text
        assert instance.redirect_uri in caplog.text

        # Verify print message
        print_mock.assert_called_once()
        assert "Please visit this URL" in print_mock.call_args[0][0]
        assert instance.redirect_uri in print_mock.call_args[0][0]

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