test(structural): add parser failure golden fixture

[nia-sg-bot]

Summary

• add a checked-in golden fixture for a Python Tree-sitter syntax failure
• assert the emitted artifact keeps the file provenance while producing no symbols or relationships
• lock the warning code, scope, and deterministic parser failure detail

Part of #22.

Validation

• python3 -m pytest (150 passed)
• git diff --check

Remaining work

Other #22 acceptance slices, including additional deterministic topology coverage, remain tracked by the parent issue.

Summary by CodeRabbit

• Tests
  • Added coverage for Python parsing failures using a golden fixture.
  • Verified that failed files are reported accurately without inventing symbol or relationship changes.
  • Confirmed parse-failure warnings and analysis metadata are captured consistently.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 9e934092-7321-43f4-a391-e88c36408e08

📥 Commits

Reviewing files that changed from the base of the PR and between ac1cfe9 and ea4c1c0.

📒 Files selected for processing (2)

• tests/fixtures/python_parser_failure.json
• tests/test_structural.py

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The PR adds a golden fixture for a Python parse failure and updates the structural test to compare the generated artifact with that fixture.

Changes

Parse failure validation

Layer / File(s)	Summary
Golden fixture comparison tests/fixtures/python_parser_failure.json, tests/test_structural.py	The fixture defines the expected modified file, empty symbols and relationships, skipped-file metadata, and PARSE_FAILURE warning. The structural test compares the generated artifact with these values.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to ea4c1

This change only strengthens regression coverage for parser-failure output without changing production behavior, so no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a golden fixture for a structural parser failure test.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nia/issue-22-syntax-failure-fixture

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