test(harness): isolate imports and stabilize browser and DNS fixtures

tests/test_web_search_raw_json_tool_call.py

@@ -9,41 +9,8 @@ That is an intended tool call in non-native/textual tool mode, but older parsing
 only recognized fenced blocks, [TOOL_CALL], XML invoke, and tool_code markup.
 """
 import json
-import sys
-from unittest.mock import MagicMock
-
-# This module needs the real agent-tool stack; importing it pulls in heavy
-# DB/auth deps, so we stub those just long enough to import, then restore them.
-# We deliberately do NOT pop src.tool_execution: popping and re-importing it
-# rebinds the `src` package's `tool_execution` attribute, so a later
-# `import src.tool_execution as te` resolves to a different module object than
-# the one its functions live in - which silently breaks tests that monkeypatch
-# it (e.g. test_edit_file's admin gate) and breaks request-scoped ContextVars.
-_ABSENT = object()
-_AGENT_MODULES = ["src.agent_tools", "src.tool_parsing", "src.tool_schemas"]
-_STUBBED = [
-    "sqlalchemy", "sqlalchemy.orm", "sqlalchemy.ext", "sqlalchemy.ext.declarative",
-    "sqlalchemy.ext.hybrid", "sqlalchemy.sql", "sqlalchemy.sql.expression",
-    "src.database", "core.models", "core.database", "core.auth",
-]
-_saved_stubs = {name: sys.modules.get(name, _ABSENT) for name in _STUBBED}
-
-for _mod in _AGENT_MODULES:
-    sys.modules.pop(_mod, None)
-for _mod in _STUBBED:
-    if _mod not in sys.modules:
-        sys.modules[_mod] = MagicMock()
-
-import src.agent_tools  # noqa: E402, F401
-from src.tool_parsing import parse_tool_blocks, strip_tool_blocks  # noqa: E402
-
-# Drop the stubs we installed so they do not leak into later tests.
-for _name, _original in _saved_stubs.items():
-    if _original is _ABSENT:
-        sys.modules.pop(_name, None)
-    else:
-        sys.modules[_name] = _original
 
+from src.tool_parsing import parse_tool_blocks, strip_tool_blocks
 
 def test_raw_json_after_web_search_phrase_runs_as_web_search():
     text = (