test: stabilize coverage ratchet paths

tests/test_db_plugin_framework.py

@@ -287,6 +287,7 @@ def test_only_declared_tables_are_created(plugin_data_root, sqlite_backend):
 def test_sqlite_database_lands_in_the_plugin_data_directory(plugin_data_root, sqlite_backend):
     """SQLite 库文件落在插件数据目录下，句柄独占引擎，不带 schema。"""
     handle = registry_module.get_database("demo")
+    assert registry_module.database_handles() == (handle,)
     assert handle.db_path == plugin_data_root / "demo" / "plugin.db"
     assert handle.owns_engine is True
     assert handle.schema is None

tests/test_event_runtime_components.py

@@ -7,6 +7,7 @@ from unittest.mock import Mock
 
 import pytest
 
+import app.startup.initializers.modules as modules_initializer
 from app.foundation.singleton import Singleton
 from app.runtime.event.binding import (
     EventBindingResolver,
@@ -188,6 +189,7 @@ def test_unloaded_module_decorator_wrapped_method_is_skipped() -> None:
 
 def test_free_function_handler_still_invoked_directly() -> None:
     """自由函数处理器不属于类声明，保持直调路径不被新跳过逻辑影响。"""
+    assert EventRegistry.handler_class_identifier(_free_function_handler) is None
     binding = EventBindingResolver(
         lock=threading.Lock(),
         resolvers=lambda: {},
@@ -324,6 +326,17 @@ def test_all_decorated_host_handler_classes_have_explicit_factories() -> None:
     }
 
 
+def test_plugin_classification_fields_skip_unmaterialized_manager(monkeypatch) -> None:
+    """插件管理器尚未创建时，分类字段 provider 应返回空快照。"""
+    monkeypatch.setattr(
+        modules_initializer,
+        "get_existing_plugin_manager",
+        lambda: None,
+    )
+
+    assert modules_initializer._plugin_classification_fields() == ()
+
+
 @pytest.mark.parametrize(
     ("backend_type", "redis_owners"),
     [

tests/test_feishu_longconn.py

@@ -217,6 +217,20 @@ def test_fatal_error_stops_reconnect(monkeypatch):
     assert attempts == [1]
 
 
+def test_stop_requested_during_connection_error_stops_without_reconnect(monkeypatch):
+    """连接异常发生后若已收到停止请求，run() 应立即退出而不再重连。"""
+    conn = _connection()
+
+    def fail_after_stop():
+        """模拟底层连接先收到停止请求、随后抛出断连异常。"""
+        conn._stop_event.set()
+        raise ConnectionError("peer closed")
+
+    monkeypatch.setattr(conn, "_run_once", fail_after_stop)
+
+    conn.run()
+
+
 def test_reconnect_count_limit(monkeypatch):
     """服务端限定重连次数时，连续失败超过上限后停止。"""
     attempts = []

tests/test_llm_helper_testcall.py

@@ -643,6 +643,20 @@ def test_openai_compatible_patch_skips_when_reasoning_content_missing() -> None:
     assert "reasoning_content" not in payload["messages"][1]
 
 
+def test_interleaved_reasoning_patch_skips_model_without_payload_method() -> None:
+    """模型没有请求负载方法时应记录并跳过补丁，而不是构造临时兼容实现。"""
+
+    class _ModelWithoutPayload:
+        """没有请求负载方法的最小模型替身。"""
+
+    llm_module._patch_interleaved_reasoning_request_support(
+        _ModelWithoutPayload,
+        patch_marker="_interleaved_reasoning_test_patch",
+    )
+
+    assert not hasattr(_ModelWithoutPayload, "_interleaved_reasoning_test_patch")
+
+
 def test_get_llm_uses_deepseek_thinking_level_controls() -> None:
     calls = []
     patch_calls = []

tests/test_module_manager_capability_adapter.py

@@ -877,7 +877,7 @@ assert configured_modules.isdisjoint(sys.modules)
 
 
 def test_event_resolver_uses_exact_class_and_blocks_stopped_owner_fallback(
-    module_manager_harness,
+    module_manager_harness, monkeypatch,
 ) -> None:
     """同名 class 不能冒充 owner；已停止 owner 必须返回 Binding(None)。"""
     manager = module_manager_harness.manager
@@ -892,6 +892,13 @@ def test_event_resolver_uses_exact_class_and_blocks_stopped_owner_fallback(
         owner_name="Sample",
     )
 
+    manager._modules.pop("SampleModule")
+    snapshot = Mock()
+    monkeypatch.setattr(manager._runtime, "snapshot", snapshot)
+    materialized_binding = manager.resolve_event_handler_instance(module_class)
+    assert materialized_binding == active_binding
+    snapshot.assert_called_once_with("SampleModule")
+
     impostor = type("SampleModule", (), {})
     impostor.__module__ = module_class.__module__
     assert manager.resolve_event_handler_instance(impostor) is None

tests/test_plugin_gil_attribution.py

@@ -99,6 +99,7 @@ def test_loader_attributes_module_import_to_installed_plugin_id(tmp_path, monkey
     for name in ("pureplugin", "nativeplugin"):
         (tmp_path / name).mkdir()
         (tmp_path / name / "__init__.py").write_text("", encoding="utf-8")
+    (tmp_path / "_ignored").mkdir()
 
     def import_module(module_name: str) -> ModuleType:
         if module_name == "app.plugins.nativeplugin":

tests/test_scheduler_compat.py

@@ -3,6 +3,8 @@
 import importlib
 import inspect
 
+import pytest
+
 from app.scheduler import Scheduler, SchedulerChain
 from app.scheduler.facade import Scheduler as ConcreteScheduler
 
@@ -17,6 +19,12 @@ def test_scheduler_package_root_keeps_legacy_type_identity() -> None:
     assert SchedulerChain.__module__ == "app.scheduler"
 
 
+def test_scheduler_package_root_rejects_unknown_attribute() -> None:
+    """旧包根只暴露声明的兼容入口，未知属性应保持标准 AttributeError。"""
+    with pytest.raises(AttributeError, match="missing_scheduler_entrypoint"):
+        getattr(importlib.import_module("app.scheduler"), "missing_scheduler_entrypoint")
+
+
 def test_scheduler_legacy_methods_keep_plugin_call_shapes() -> None:
     """旧插件使用的四个方法继续保留原调用参数形态。"""
     start = inspect.signature(Scheduler.start)