Write pipeline stage transition tests for mgw:run via mock agents

[snipcodeit]

Description

Simulate a full mgw:run cycle (triage to plan to execute to verify to pr-created) using mock agents. Assert: pipeline_stage transitions, checkpoint pipeline_step progression, comments posted at each stage, board Status field updated via mock GraphQL. One happy-path test and two failure-mode tests.

Acceptance Criteria

• Write pipeline stage transition tests for mgw:run via mock agents

Milestone Context

Milestone	v6 — Local Testing & Simulation Framework
Phase	Phase 48: State & Pipeline Tests
GSD Route	plan-phase
Phase Position	Phase 2 of 4 in milestone

Milestone Goal

Offline test suite with mock GitHub API and fake GSD agents to validate MGW orchestration logic without requiring live GitHub tokens or active Claude API calls.

Phase Goal

Test coverage for lib/state.cjs functions, the validate_and_load pattern, and core pipeline stage transitions used in mgw:run and mgw:milestone.

Dependencies

write-tests-for-checkpoint-read-write-and-resume

Scope Hints

• Estimated route: plan-phase
• Labels: testing,pipeline

[snipcodeit]

MGW · work-started · 2026-03-06T09:54:24Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 48: State & Pipeline Tests

Work Started

Issue	#252 — Write pipeline stage transition tests for mgw:run via mock agents
Route	plan-phase
Phase	48 — State & Pipeline Tests
Position	6 of 11

Pipeline executing autonomously...

[snipcodeit]

MGW pr-ready · 2026-03-06T10:08:38Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 48: State & Pipeline Tests

PR Ready

PR #263 — #263

Added 28 vitest tests in test/pipeline-transitions.test.js simulating a full mgw:run cycle via mock agents — 3 suites covering happy-path, empty-agent failure, and blocking-comment failure, plus checkpoint step progression.

Testing procedures posted on the PR.
This issue will auto-close when the PR is merged.

Pipeline Summary

Stage	Status
Triage	✓
Planning	✓
Execution	✓
PR Creation	✓

[snipcodeit]

MGW · pr-ready · 2026-03-06T10:09:18Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 48: State & Pipeline Tests

PR Ready

PR #263 — #263

Milestone Progress (6/11 complete)

#	Issue	Status	PR
247	Create lib/mock-github.cjs	✓ Done	#258
248	Create lib/mock-gsd-agent.cjs	✓ Done	#259
249	Add vitest test runner	✓ Done	#260
250	Integration tests: validate_and_load	✓ Done	#261
251	Tests: checkpoint read/write	✓ Done	#262
252	Pipeline stage transition tests	✓ Done	#263
253	Scenario tests: mgw:project	○ Pending	—
254	Scenario tests: mgw:milestone	○ Pending	—
255	Scenario tests: mgw:sync	○ Pending	—
256	GitHub Actions test workflow	○ Pending	—
257	Vitest coverage reporting	○ Pending	—