Add GeoIP-Regions test fixture

[mmpnelson]

Adds a 5-record test MMDB for the GeoIP-Regions database type. Records cover IPv4 and IPv6 networks, ranked alternate_locations with country and subdivision confidences, multiple subdivisions on one record, an alternate country with no subdivisions, alternates without confidence values, and a record with no alternate_locations.

Summary by CodeRabbit

• Tests
  • Expanded GeoIP region test coverage for IPv4, IPv6, and IPv4-mapped IPv6 addresses.
  • Added test scenarios covering country, location, subdivision, confidence, and alternate-location metadata.
  • Updated test database generation to include the GeoIP regions dataset alongside existing database types.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 7402ca85-fd0f-4514-9892-c422b50516fc

📥 Commits

Reviewing files that changed from the base of the PR and between 7fcd868 and 6f982b5.

📒 Files selected for processing (3)

• pkg/writer/geoip2.go
• source-data/GeoIP-Regions-Test.json
• test-data/GeoIP-Regions-Test.mmdb

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

Changes

GeoIP Regions database generation

Layer / File(s)	Summary
Add region data and generation mapping source-data/GeoIP-Regions-Test.json, pkg/writer/geoip2.go	The test data adds five IPv4 and IPv6 records with geographic metadata. The writer includes GeoIP-Regions in the database generation map.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to 6f982

The new GeoIP Regions fixture and committed MMDB are valid and load correctly, with no actionable merge risk identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.
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 GeoIP-Regions test fixture.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pnelson/add-geoip-regions-test-database

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