fix(i-e): Mail-Suite 46/46 gruen in 94s statt 18:29min — globales IMAP-Mock-Fixture + 3 echte Fixes

Root-Cause der 35 Suite-Timeouts: test_delete_folder trigger imap_delete_folder -> echter aioimaplib.IMAP4_SSL-Connect zu imap.example.com blockiert bis Netzwerk-Timeout; der blockierte Call vergiftet Event-Loop fuer alle nachfolgenden Tests (Kaskade ab 12. Test).

Fixes: (1) tests/conftest.py: autouse mock_imap_connections-Fixture mit deterministischem Fake-IMAP-Client (_FakeIMAPResponse, alle Client-Methoden) via monkeypatch auf services.aioimaplib.IMAP4_SSL. (2) create_mail_account setzt owner_id=user_id gemaess OwnedMixin-Contract — vorher NULL -> get_effective_access read statt admin -> 403 bei assign_shared_users (echter Production-Bug). (3) test_download_attachment: storage_path relativ zum Storage-Root — Path-Traversal-Guard hat korrekt gearbeitet. (4) GET /mail/threads gibt Plain Array zurueck — konsistent mit Geschwister-Routen und fetchThreads(): Promise<ThreadResult[]>.

Beweise: 46/46 passed in 94.41s (vorher 1 failed, 10 passed, 35 errors in 1109.94s); conftest-ruff-Findings auto-gefixt (8), Rest = Vorbestand E402 dynamische Plugin-Imports; Test nach Fix verifiziert.

tests/conftest.py

@@ -6,7 +6,6 @@ Auth helpers talk to the HTTP API (integration tests).
 
 from __future__ import annotations
 
-import asyncio
 import os
 import shutil
 import subprocess
@@ -40,28 +39,30 @@ from app.core.auth import hash_password
 from app.core.db import Base, close_engine, reset_engine_for_testing
 from app.core.service_container import get_container  # noqa: F401
 from app.main import create_app
+
 try:
     from app.models.ai_conversation import AIConversation, AIMessage  # noqa: F401
 except ImportError:
     pass
+from app.ai.oversight import DecisionRecordDB  # noqa: F401 — ensure table is created
 from app.models.compliance import ComplianceIncident  # noqa: F401
+from app.models.consumer_inbox import ConsumerInbox  # noqa: F401
 from app.models.contact import Contact, ContactPerson  # noqa: F401
 from app.models.contact_merge import ContactMergeHistory  # noqa: F401
+from app.models.outbox import EventOutbox  # noqa: F401
 from app.models.plugin import Plugin, PluginMigration  # noqa: F401
 from app.models.role import Role
+from app.models.saved_filter import SavedFilter  # noqa: F401
 from app.models.tenant import Tenant
 from app.models.user import User, UserTenant
 from app.models.user_preference import UserPreference  # noqa: F401
 from app.models.workflow import Workflow, WorkflowInstance, WorkflowStepHistory  # noqa: F401
 from app.plugins.builtins.calendar import CalendarPlugin  # noqa: F401
-from app.models.outbox import EventOutbox  # noqa: F401
-from app.models.consumer_inbox import ConsumerInbox  # noqa: F401
-from app.models.saved_filter import SavedFilter  # noqa: F401
-from app.ai.oversight import DecisionRecordDB  # noqa: F401 — ensure table is created
 
 # Dynamically import all plugin models so Base.metadata.create_all() includes their tables.
 # This replaces ~30 hardcoded plugin imports with dynamic discovery (P1-14 fix).
 from app.plugins.registry import get_registry
+
 _registry = get_registry()
 _registry.discover_builtins()
 for _plugin_name in _registry.list_discovered():
@@ -84,19 +85,24 @@ for _plugin_name in _registry.list_discovered():
 
 # Also import core models that may be missing
 # Wiki plugin models — not loaded by get_entity_models()
-from app.plugins.builtins.wiki.models import WikiArticle, WikiArticleVersion, WikiCategory  # noqa: F401
+from app.core.permission_registry import init_permission_registry  # noqa: F401
+
 # Knowledge plugin models — new plugin, ensure table is created in test-DB
 from app.plugins.builtins.knowledge.models import KnowledgeExtraction  # noqa: F401
+
 # Self-improvement plugin models — new plugin, ensure tables are created in test-DB
 from app.plugins.builtins.self_improvement.models import (  # noqa: F401
-    ImprovementSignal,
+    ImpactMeasurement,
     ImprovementPattern,
     ImprovementProposal,
-    ImpactMeasurement,
+    ImprovementSignal,
+)
+from app.plugins.builtins.wiki.models import (  # noqa: F401
+    WikiArticle,
+    WikiArticleVersion,
+    WikiCategory,
 )
-
 from app.plugins.registry import reset_registry_for_testing  # noqa: F401
-from app.core.permission_registry import init_permission_registry  # noqa: F401
 from app.services.plugin_service import reset_plugin_service_for_testing  # noqa: F401
 
 # Import plugin models so Base.metadata.create_all includes their tables
@@ -105,6 +111,7 @@ TEST_DB_URL = "postgresql+asyncpg://leocrm:leocrm@localhost:5432/leocrm_test"
 
 # Clear settings cache so the env overrides (set at top of file) take effect
 from app.config import get_settings
+
 get_settings.cache_clear()
 
 
@@ -145,7 +152,7 @@ def _run_migrations():
         raise RuntimeError(
             f"alembic upgrade head failed: {result.stderr or result.stdout}"
         )
-    print(f"[CONFTEST] alembic upgrade head completed successfully")
+    print("[CONFTEST] alembic upgrade head completed successfully")
 
 
 @pytest.fixture(scope="session", autouse=True)
@@ -382,6 +389,86 @@ async def redis_client() -> AsyncGenerator[aioredis.Redis, None]:
     await r.aclose()
 
 
+# ─── Global IMAP mocking (Block I-E) ────────────────────────────────────────
+#
+# The mail service layer opens real aioimaplib.IMAP4_SSL connections to the
+# account's imap_host (test fixtures use imap.example.com). Those calls block
+# until network timeout and cascade: one hanging test poisons the event loop
+# for every following test (35 suite-wide timeouts measured).
+#
+# This autouse fixture replaces IMAP4_SSL with a deterministic fake client for
+# EVERY test — no test can accidentally hit the network.
+
+
+class _FakeIMAPResponse:
+    """Mimics aioimaplib response objects: tuple-like + .result attribute."""
+
+    def __init__(self, result="OK", lines: list | None = None):
+        self.result = result
+        self.lines = lines or []
+
+    def __getitem__(self, idx):
+        if idx == 0:
+            return self.result
+        return self.lines[idx - 1] if 0 < idx <= len(self.lines) else []
+
+
+def _build_fake_imap_client():
+    from unittest.mock import AsyncMock, MagicMock
+
+    client = MagicMock()
+    client.wait_hello_from_server = AsyncMock(return_value=None)
+    client.login = AsyncMock(return_value=_FakeIMAPResponse("OK", [b"Logged in"]))
+    client.logout = AsyncMock(return_value=_FakeIMAPResponse("OK", [b"Bye"]))
+    # select(folder) → OK with EXISTS count
+    client.select = AsyncMock(
+        return_value=_FakeIMAPResponse("OK", [b"0"])
+    )
+    # uid_search(...) → response whose [1][0] is a space-separated uid bytes list
+    client.uid_search = AsyncMock(
+        return_value=_FakeIMAPResponse("OK", [b""])
+    )
+    # uid('fetch', ...) → minimal RFC822 envelope; services parse defensively
+    fetch_resp = _FakeIMAPResponse(
+        "OK",
+        [
+            (
+                b"1 (RFC822 {5}",
+                b"Subject: t\r\n\r\nbody",
+            ),
+            b")",
+        ],
+    )
+    client.uid = AsyncMock(return_value=fetch_resp)
+    client.getquotaroot = AsyncMock(
+        return_value=_FakeIMAPResponse("OK", [b"", b"(STORAGE 0 0)"])
+    )
+    client.list = AsyncMock(
+        return_value=_FakeIMAPResponse("OK", [])
+    )
+    client.append = AsyncMock(return_value=_FakeIMAPResponse("OK", [b"Appended"]))
+    return client
+
+
+@pytest.fixture(autouse=True)
+def mock_imap_connections(monkeypatch):
+    """Replace aioimaplib.IMAP4_SSL everywhere with a deterministic fake.
+
+    Autouse for all tests: any code path touching IMAP gets an instant fake
+    client instead of a blocking network call to a non-existent host.
+    """
+    fake_client = _build_fake_imap_client()
+
+    def _fake_factory(*args, **kwargs):
+        return fake_client
+
+    monkeypatch.setattr(
+        "app.plugins.builtins.mail.services.aioimaplib.IMAP4_SSL",
+        _fake_factory,
+    )
+    yield fake_client
+
+
 @pytest_asyncio.fixture(scope="session")
 async def engine() -> AsyncGenerator[AsyncEngine, None]:
     """Async engine for the test database (session-scoped for speed)."""
@@ -690,8 +777,8 @@ async def dms_app(engine: AsyncEngine, redis_client):
     container = get_container()
     await container.initialize()
 
-    from app.plugins.builtins.permissions.plugin import PermissionsPlugin
     from app.plugins.builtins.dms.plugin import DmsPlugin
+    from app.plugins.builtins.permissions.plugin import PermissionsPlugin
     from app.plugins.builtins.tasks.plugin import TasksPlugin
     registry.register_plugin(PermissionsPlugin())
     registry.register_plugin(DmsPlugin())
@@ -805,9 +892,9 @@ async def mcp_app(engine: AsyncEngine, redis_client):
     container = get_container()
     await container.initialize()
 
-    from app.plugins.builtins.permissions.plugin import PermissionsPlugin
-    from app.plugins.builtins.mcp_server.plugin import McpServerPlugin
     from app.plugins.builtins.mcp_client.plugin import McpClientPlugin
+    from app.plugins.builtins.mcp_server.plugin import McpServerPlugin
+    from app.plugins.builtins.permissions.plugin import PermissionsPlugin
     registry.register_plugin(PermissionsPlugin())
     registry.register_plugin(McpServerPlugin())
     registry.register_plugin(McpClientPlugin())