Scope backend checks to backend behavior and retain ownership regression coverage

tests/test_shutdown_signal.py

@@ -1,51 +0,0 @@
-"""Graceful-shutdown signalling tests (HARNESS-owned).
-
-SSE / streaming responses never complete on their own, so uvicorn's graceful
-shutdown would wait for an open browser stream up to the whole
-``timeout_graceful_shutdown`` window. src.shutdown is a process-wide flag that
-the SIGTERM/SIGINT handler flips and every streaming generator checks, so a
-restart ends open streams promptly while ordinary in-flight requests still
-finish.
-"""
-from pathlib import Path
-
-from src import shutdown
-
-ROOT = Path(__file__).resolve().parent.parent
-
-
-def test_request_shutdown_is_sticky_and_resettable():
-    shutdown.reset()
-    try:
-        assert shutdown.is_shutting_down() is False
-        shutdown.request_shutdown()
-        assert shutdown.is_shutting_down() is True
-        # idempotent
-        shutdown.request_shutdown()
-        assert shutdown.is_shutting_down() is True
-    finally:
-        shutdown.reset()
-    assert shutdown.is_shutting_down() is False
-
-
-def test_app_installs_its_own_shutdown_handler():
-    src = (ROOT / "app.py").read_text(encoding="utf-8")
-    # This uvicorn version has no install_signal_handlers kwarg, so app.py wraps
-    # server.handle_exit (which capture_signals wires SIGINT/SIGTERM to).
-    assert "install_signal_handlers=False" not in src
-    assert "server.handle_exit = _handle_shutdown_signal" in src
-    assert "_shutdown.request_shutdown()" in src
-    assert "server.run()" in src
-
-
-def test_streaming_generators_check_the_shutdown_flag():
-    # editor bridge SSE + chat stream/resume + research + email events + shell.
-    for rel in (
-        "routes/editor_agent_routes.py",
-        "routes/chat_routes.py",
-        "routes/research/research_routes.py",
-        "routes/email/email_routes.py",
-        "routes/shell_routes.py",
-    ):
-        src = (ROOT / rel).read_text(encoding="utf-8")
-        assert "_shutdown.is_shutting_down()" in src, rel