[DeathGun44]

Overview

pkg/processtree/reparenting had no tests for DefaultStrategy, FallBackStrategy, or the logic that picks between strategies. This PR adds them, plus a one-line fix.

New tests:

• DefaultStrategy: exiting process missing, PPID 0, parent missing, parent tracked.
• FallBackStrategy: always applicable, always returns 1.
• Reparenting logic: no children, the first strategy wins when it applies, then the first match in order, the "no strategy found" error, AddStrategy and GetStrategies.

Fix: DefaultStrategy.Name() returned "fallback", the same as FallBackStrategy. It was "default" in the early #591 work and changed when the strategies were split into separate files. Nothing calls Name() today. Happy to drop this commit if the shared name is intentional.

Coverage of ./pkg/processtree/reparenting/... goes from 20.0% to 90.8% (Go 1.27.3).

How to Test

go test -race -count=3 ./pkg/processtree/reparenting/...

Summary by CodeRabbit

• Tests
  • Expanded coverage for process reparenting, including cases with missing or untracked parents, processes without children, and selection between reparenting strategies. Added checks for strategy ordering, when a strategy applies, and the parent process selected. These checks help verify consistent behavior across common and edge-case process tree scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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• Layers: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 101514fb-f854-42a7-b7d2-e4f6ba4e0391

📥 Commits

Reviewing files that changed from the base of the PR and between c7a77c1 and c0d1ab7.

📒 Files selected for processing: 4

• pkg/processtree/reparenting/reparenting_strategies_test.go
• pkg/processtree/reparenting/strategies/default.go
• pkg/processtree/reparenting/strategies/default_test.go
• pkg/processtree/reparenting/strategies/fallback_test.go

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

📝 Walkthrough

The default reparenting strategy is now named "default" instead of "fallback". New tests cover strategy behavior, registration and ordering, strategy selection, and strategy-list copying.

Changes: Reparenting strategies

Layer / File(s)	Summary
Strategy names and parent selection pkg/processtree/reparenting/strategies/default.go, pkg/processtree/reparenting/strategies/default_test.go, pkg/processtree/reparenting/strategies/fallback_test.go	The default strategy name changes to "default". Tests check default and fallback strategy names, applicability, and selected parent PIDs.
Strategy registration and reparenting pkg/processtree/reparenting/reparenting_strategies_test.go	Tests cover strategy registration and ordering, empty child lists, first-applicable selection, missing applicable strategies, default-strategy parent selection, and strategy-list copying.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to c0d1a

The strategy rename and added tests appear ready to merge after normal checks.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the added tests for reparenting strategy selection and fallback behavior.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[matthyx]

No blocking findings. The new tests cover existing strategy ordering, short-circuiting, parent eligibility, fallback behavior, and returned-slice isolation. The base still gives DefaultStrategy and FallBackStrategy the same name; correcting DefaultStrategy to default is sound and does not change PID selection. Related #591/#604 history provides no objection to this correction; #1027 and #876 address different process-tree paths and do not supersede this coverage.

Validated go test -mod=readonly -race -count=3 ./pkg/processtree/reparenting/... with Go 1.27.0 in an isolated container: both packages passed. Formatting and diff checks also pass. No full-agent build/full-suite run; a separate baseline assertion run did not finish, so no completed before/after result is claimed. Listed CI contains successful DCO, GitGuardian, and CodeRabbit checks, with no build/unit-test result.

Reviewed head c0d1ab7 against main c7a77c1. Immediately rechecked: still open, non-draft, mergeable, unchanged head/base, and no review threads. Independent code and architecture reviews found no blockers.

[DeathGun44]

Thanks for the quick review!