Add test for coverage, avoid crash on missing _stopping.

tests/test_signal_handlers.py

@@ -5,6 +5,7 @@ import signal
 from queue import Queue
 from unittest.mock import MagicMock
 
+from sanic.compat import ctrlc_workaround_for_windows
 from sanic.response import HTTPResponse
 from sanic.testing import HOST, PORT
 
@@ -58,3 +59,24 @@ def test_dont_register_system_signals(app):
 
     app.run(HOST, PORT, register_sys_signals=False)
     assert calledq.get() is False
+
+
+def test_windows_workaround(app):
+    """Test Windows workaround (on any OS)"""
+    too_slow = False
+
+    @app.add_task
+    async def signaler(app):
+        ctrlc_workaround_for_windows(app)
+        await asyncio.sleep(0.1)
+        os.kill(os.getpid(), signal.SIGINT)
+
+    @app.add_task
+    async def timeout(app):
+        nonlocal too_slow
+        await asyncio.sleep(1)
+        too_slow = True
+        app.stop()
+
+    app.run(HOST, PORT)
+    assert not too_slow