test(snapshot): cover SHA-256 Git object provenance

[nia-sg-bot]

Summary

• add an SHA-256 repository fixture for exact Git snapshot provenance
• verify unstaged and immutable commit-range resolution retain full 64-character blob and commit object IDs

Validation

• python3 -m pytest tests/test_git_snapshot.py -q
• python3 -m pytest -q
• git diff --check

Part of #21

Summary by CodeRabbit

• Tests
  • Added coverage for repositories using Git’s SHA-256 object format.
  • Verified that unstaged changes and commit ranges preserve complete 64-character object identities.
  • Confirmed commit-range results retain the exact base, head, and comparison-base commit IDs.

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• tests/test_git_snapshot.py

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• tests/test_git_snapshot.py

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Walkthrough

The tests add SHA-256 Git repository setup and verify that unstaged snapshots and commit ranges preserve complete blob and commit identities without warnings.

Changes

SHA-256 Git snapshot coverage

Layer / File(s)	Summary
SHA-256 repository and snapshot validation tests/test_git_snapshot.py	Adds a SHA-256 repository helper. Tests verify 64-character blob and commit identities, exact range endpoints, comparison bases, and warning behavior.

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

Merge Risk: ⚪ Minimal · up to 53f14

This change adds SHA-256 Git snapshot coverage without modifying production behavior. No merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 1 files.	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 snapshot tests for Git repositories that use SHA-256 object IDs.
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.

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• Commit on current branch

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• Create PR with unit tests
• Commit unit tests in branch nia/issue-21-sha256-snapshot-fixtures

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Actionable comments posted: 1

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Inline comments:
In `@tests/test_git_snapshot.py`:
- Line 201: Update the assertion covering ranged commit IDs to compare base_oid
with oid(repo, "before") and head_oid with oid(repo, "HEAD"), and assert that
comparison_base_oid equals base_oid; remove the length-only validation.

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Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 4fa4f1e5-c591-4d0e-b7b8-eb68d4bbc3b0

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Reviewing files that changed from the base of the PR and between dfa15c2 and b924c0d.

📒 Files selected for processing (1)

• tests/test_git_snapshot.py

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

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