test: cleanup test suite per #234 — xfail triage, flaky fix, L2 skip removal, file consolidation

[Million-mo]

Summary

Test suite cleanup addressing issue #234. All changes are test-only — no production code modified.

Changes

P0: Trivial cleanup

• Delete orphan snapshot (tests/__snapshots__/test_acp_event_converter_snapshots.ambr, 702 lines, zero references)
• Remove documented pre-fix xfail (test_nested_async_generator_span_leak — fix verified by test_nested_async_generator_aclosing_fix)

P1: xfail triage (8 → 6, all with issue refs)

• Remove xfail from test_post_init (bug fixed, verified with --runxfail)
• Update 5 xfail reasons to reference tracking issues: Bug: OpenCode POST /session/{id}/fork returns 500 Internal Server Error #250, Bug: TestModel produces empty text content in OpenCode multi-turn (E2 red-flag) #251, Bug: Agent recreated from manifest config loses SubagentTools capability (session_pool path) #252, ACP: Missing SessionUpdate notifications (user_message_chunk + tool_call_start/end) #196, OpenCode: share_session endpoint fails #198, OpenCode: Prompt delivery modes (steer + queue) not working #199
• Created new sub-issues: Bug: OpenCode POST /session/{id}/fork returns 500 Internal Server Error #250 (fork 500), Bug: TestModel produces empty text content in OpenCode multi-turn (E2 red-flag) #251 (TestModel empty text), Bug: Agent recreated from manifest config loses SubagentTools capability (session_pool path) #252 (manifest capability loss)

P2: Flaky fixture root cause fix

• Root cause: test_source_type.py::test_circular_import_safety called importlib.reload(messagenode) in-process, replacing the MessageNode class object. This broke isinstance/match checks for all previously created Agent instances in batch runs.
• Fix: Run the reload test in a subprocess to isolate module cache pollution
• Remove 3 flaky skip markers (test_group_stats_aggregation, test_callback_chain, test_agent_pool_conversation_flow)
• Delete stale test_agent_pool_conversation_flow (empty pass body, API removed)

P2: L2 migration skip removal (18 → 0 in this file)

• Remove all 18 skip markers from test_acp_protocol_handler_input_provider.py
• Fix mock_client: MagicMock → AsyncMock (production code now awaits client.session_update)
• Fix RunHandle._turn_complete_event → complete_event (renamed in per-prompt RunHandle refactor)

WS1+WS6: File consolidation

• Move 5 root-level test files to proper subdirectories:
  • phase8_merge_queue_removal_test.py → tests/utils/test_merge_queue_removal.py
  • phase8_shutdown_race_condition_test.py → tests/lifecycle/test_shutdown_race_condition.py
  • phase8_subagent_cascade_test.py → tests/orchestrator/test_subagent_cascade.py
  • test_event_bus_mechanics.py → tests/orchestrator/test_event_bus_mechanics.py
  • test_processors.py → tests/_helpers/test_processors.py
• Update 6 string import references in test_history_processors.py

7b: VCR cassette backlog

• Update 9 skipif reasons in test_opencode_protocol.py to reference Test suite cleanup: remove obsolete tests, fix broken/skipped tests #234

Metrics

Metric	Before	After
xfail total	8	6
xfail with issue refs	2	6 (100%)
Flaky skips	3	0
L2 migration skips (this file)	18	0
Root-level test files	5	0
Orphan snapshots	1	0

Verification

• tests/messaging/: 120 passed, 0 failed (was 3 flaky skips)
• test_acp_protocol_handler_input_provider.py: 21 passed, 0 failed (was 18 skips)
• test_span_hierarchy.py: 5 passed (was 5 pass + 1 xfail)
• test_post_init: PASSED (was xfail)
• All moved files pass in new locations (38 passed, 1 pre-existing skip)

New issues created

• Bug: OpenCode POST /session/{id}/fork returns 500 Internal Server Error #250 — OpenCode POST /session/{id}/fork returns 500
• Bug: TestModel produces empty text content in OpenCode multi-turn (E2 red-flag) #251 — TestModel produces empty text content in OpenCode multi-turn
• Bug: Agent recreated from manifest config loses SubagentTools capability (session_pool path) #252 — Agent recreated from manifest config loses SubagentTools capability

Deferred (blocked by other issues)

• 5 orchestrator L2 migration files — blocked by Merge SessionController into SessionPool — eliminate leaky abstraction #163 (SessionController merge)
• test_agent_context_resources_unused.py — blocked by Audit: Dead Code, Wrapper Collapse, and Oversized Files #123 (dead code audit)
• test_opencode_protocol.py 9 cassettes — requires human with OPENAI_API_KEY
• Remaining 29 L2 migration skips across 12 files — tracked by Tracking: Remaining layered-testing-infrastructure work (HUMAN-REQUIRED cassettes + L2 migration) #188

Closes #234 (partially — deferred items tracked separately)

[gemini-code-assist]

Code Review

This pull request cleans up the test suite by removing several skipped and obsolete tests, updating import paths, and appending issue references to xfail reasons. Notably, the circular import safety test is refactored to run in a subprocess to avoid polluting the main process's module cache. Feedback on this change suggests propagating sys.path from the parent process to the subprocess to ensure reliable imports across different execution environments.

Important

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[gemini-code-assist]

When running a Python command in a subprocess via sys.executable -c, the current working directory or virtual environment's import paths (sys.path) might not be fully propagated or inherited depending on how the test suite is executed (e.g., via IDEs, specific CI environments, or without PYTHONPATH set). Prepending sys.path from the parent process to the subprocess's sys.path ensures that the agentpool package and its dependencies can be imported reliably without throwing ModuleNotFoundError.

    result = subprocess.run(
        [
            sys.executable,
            "-c",
            (
                "import sys; "
                f"sys.path.extend({sys.path!r}); "
                "import importlib; "
                "mod = importlib.import_module('agentpool.messaging.messagenode'); "
                "importlib.reload(mod); "
                "assert hasattr(mod, 'SourceType'); "
                "assert hasattr(mod, 'get_source_type'); "
                "importlib.import_module('agentpool.delegation.base_team'); "
                "print('OK')"
            ),
        ],
        capture_output=True,
        text=True,
        timeout=30,
    )

[Million-mo]

Bug Fixes Added

This PR now also includes fixes for two of the three bugs discovered during xfail triage:

#250 — Fork endpoint 500 (FIXED)

Root cause: contextlib.suppress in fork_session didn't catch ValueError raised by storage.fork_conversation when the source session has no conversation history.

Fix: Add ValueError to the suppress tuple. Forking an empty session now creates an empty fork gracefully.

Test: test_fork_session — xfail removed, passes.

#252 — Manifest config loses SubagentTools capability (FIXED)

Root cause: Test passed toolsets via Agent constructor, but session_pool recreates agents from manifest config which had no tools field.

Fix: Add SubagentToolsetConfig to NativeAgentConfig.tools in the manifest. Use TestModel with call_tools to verify capability tools are available via session_pool path.

Test: test_capability_tools — xfail removed, passes.

#251 — TestModel empty text content (DEFERRED)

Status: Legitimate test infrastructure limitation — TestModel in subprocess doesn't produce text parts in OpenCode message format without custom_output_text config. The companion test test_redflag_e1 already verifies 4 messages are produced. xfail kept with #251 reference.

Updated commit count: 9