Phase 2: Extended fake-claude.mjs scenarios and unit tests

[tinkermonkey]

Add four new scenario branches to the existing fake-claude.mjs fixture and write corresponding unit tests in the fast (offline) test suite. This strengthens coverage of EventParser and CliProcess edge cases without requiring credentials or a live binary.

Requirements

• Add session-resume scenario to fake-claude.mjs: accepts --resume <id> CLI flag, emits system/init event with that same session ID, exits cleanly with code 0
• Add rate-limit scenario: emits a rate_limit_event line on stdout (not stderr only), then exits with a non-zero code
• Add permission-request scenario: emits a server_tool_use block inside an assistant event after system/init, before the result event
• Add multi-block scenario: emits a single assistant event whose message.content array contains both a text block and a tool_use block in one emission
• Any unknown FAKE_SCENARIO value must write to stderr and exit with code 1
• Add one test per new scenario in CliProcess.test.ts and/or EventParser.test.ts, following the existing FAKE_SCENARIO injection pattern (set env var, inject fixture into PATH, collect events, assert structure)
• All new tests must pass with npm test (no credentials required)

Design Guidance

Implements the 'Extended Fake Fixture Scenarios' section of the architecture design. The four scenario names, their trigger conditions, and their expected output structure are specified in the architecture's component design table for fake-claude.mjs scenarios.

Acceptance Criteria

• FAKE_SCENARIO=session-resume with --resume <id> arg emits system/init with matching session ID
• FAKE_SCENARIO=rate-limit emits rate_limit_event on stdout and exits non-zero
• FAKE_SCENARIO=permission-request emits server_tool_use inside an assistant event
• FAKE_SCENARIO=multi-block emits a single assistant event with both text and tool_use content blocks
• Unknown FAKE_SCENARIO value causes exit code 1 with stderr message
• One new vitest test exists per scenario and passes under npm test
• npm test total test count increases by at least 4
• Code is reviewed and approved

[tinkermonkey]

Implementation

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All tests pass. Here's a summary of the changes made:

Summary

src/__tests__/fixtures/fake-claude.mjs

Added four new scenario branches:

• session-resume: Reads the --resume <id> flag from process.argv, emits system/init with that session ID, then emits result — exits with code 0
• rate-limit: Emits rate_limit_event on stdout (handled by EventParser as ErrorEvent { code: 'rate_limit' }), then exits with code 1
• permission-request: Emits system/init, then an assistant event containing a server_tool_use block (surfaces as RawEvent with rawSubtype: 'server_tool_use'), then result
• multi-block: Emits system/init, then a single assistant event whose content array contains both a text block and a tool_use block, then result

The default case (unknown scenario → stderr + exit 1) was already present.

src/__tests__/CliProcess.test.ts

Added five new integration tests using the FAKE_SCENARIO injection pattern:

1. session-resume: Passes sessionId + isFirstMessage: false → verifies ReadyEvent.sessionId matches the --resume arg
2. rate-limit: Verifies stdout rate_limit_event produces ErrorEvent { code: 'rate_limit' }
3. permission-request: Verifies server_tool_use block produces RawEvent { rawType: 'assistant', rawSubtype: 'server_tool_use' } with a clean done event
4. multi-block: Verifies both TextEvent and ToolUseEvent are emitted from a single assistant message with two content blocks
5. Unknown scenario: Verifies ErrorEvent { code: 'nonzero_exit', exitCode: 1 } when FAKE_SCENARIO is unrecognized

Total tests: 91 (up from 86, an increase of 5).

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[tinkermonkey]

🔄 Starting Review Cycle

Reviewer: Code Reviewer
Maker: Senior Software Engineer
Max Iterations: 5

The automated maker-checker review cycle is now starting. The reviewer will evaluate the work, and if changes are needed, the maker will be automatically re-invoked with feedback.

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[tinkermonkey]

Code Review

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I now have all the information needed for a thorough review. Here is my assessment:

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Status

CHANGES NEEDED

Issues Found

Critical (Must Fix)

None

High Priority (Should Fix)

• Doc comment in fake-claude.mjs not updated with new scenarios: The file header at src/__tests__/fixtures/fake-claude.mjs:2-14 documents all scenarios in a "Scenarios:" block. The four new scenarios (session-resume, rate-limit, permission-request, multi-block) are not listed. This comment is the first thing a developer reads when opening the fixture to add or debug a scenario — it should be accurate. Add the four new entries:

   *   session-resume accepts --resume <id>, emits init with that session ID + result
   *   rate-limit     emits rate_limit_event on stdout, exits 1
   *   permission-request emits init + assistant with server_tool_use + result
   *   multi-block    emits init + assistant with text+tool_use in one message + result
  

• New tests are top-level it() blocks placed outside any describe group: The existing test file uses describe blocks to group logically related tests ('golden path', 'AbortSignal', 'timeouts', 'copilot backend'). The five new tests at lines 229–277 sit between the 'timeouts' describe and the 'copilot backend' describe as bare it() blocks under a // new scenarios comment. This is inconsistent with the file's own established convention. Wrap them in describe('extended scenarios', () => { ... }) or a similarly named group. Note that the existing "other scenarios" tests (lines 106–124 for thinking and api-retry) also lack a describe block, but they at least have a clear // other scenarios section header and were pre-existing; the new code should follow the stronger pattern the file already demonstrates, not the weaker one.

Source Artefact Updates

• Issue body: The acceptance criterion "Unknown FAKE_SCENARIO value causes exit code 1 with stderr message" is listed as a new deliverable, but this behavior already existed in the default branch of fake-claude.mjs before this PR. The maker correctly identified this and only added a test (not a duplicate implementation), which is the right call. The issue body should note: "The default case already handled unknown scenarios; this task adds a test for it."

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[tinkermonkey]

Implementation

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Revision Notes

• ✅ Doc comment not updated: Added the four new scenario entries (session-resume, rate-limit, permission-request, multi-block) to the Scenarios: block in fake-claude.mjs:2-17, re-aligning all entries with consistent column padding.
• ✅ New tests outside any describe group: Wrapped all five new it() blocks in describe('extended scenarios', () => { ... }), consistent with the file's established grouping pattern ('golden path', 'AbortSignal', 'timeouts', 'copilot backend'). All 34 tests pass.

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[tinkermonkey]

Code Review

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Both issues from my previous review have been cleanly addressed. Here is my assessment:

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Status

APPROVED

Previous Issues Status

• ✅ Doc comment in fake-claude.mjs not updated with new scenarios - RESOLVED: All four new scenarios (session-resume, rate-limit, permission-request, multi-block) are now listed in the Scenarios: block at lines 14–17, with consistent column-aligned formatting matching the existing entries.
• ✅ New tests are top-level it() blocks placed outside any describe group - RESOLVED: All five new it() blocks are now wrapped in describe('extended scenarios', () => { ... }) at line 229, consistent with the file's established grouping convention ('golden path', 'AbortSignal', 'timeouts', 'copilot backend').

New Issues Found

None

Source Artefact Updates

None (the previously suggested issue body update from iteration 1 still applies — the default case for unknown scenarios was pre-existing, and the PR correctly adds only a test for it).

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[tinkermonkey]

Review Cycle Complete

Status: APPROVED

Iterations: 2/5

Maker: Senior Software Engineer

Reviewer: Code Reviewer

Review approved after 2 iteration(s)

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Starting Repair Cycle (Testing)

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✅ Repair Cycle Complete

Container: repair-cycle-code-wrapper-5-afddb20c

Exit Code: 0

Total Agent Calls: 4

Duration: 103.2s

• compilation: ✅ PASSED (1 iterations)
• unit: ✅ PASSED (1 iterations)
• integration: ✅ PASSED (1 iterations)
• ci: ✅ PASSED (1 iterations)

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