remove loop as argument and update examples

tests/test_signal_handlers.py

@@ -4,12 +4,20 @@ from sanic.utils import HOST, PORT
 from unittest.mock import MagicMock
 import pytest
 import asyncio
+from queue import Queue
 
 
-async def stop(app):
-    await asyncio.sleep(0.2)
+async def stop(app, loop):
+    await asyncio.sleep(0.1)
     app.stop()
 
+calledq = Queue()
+
+def set_loop(app, loop):
+    loop.add_signal_handler = MagicMock()
+
+def after(app, loop):
+    calledq.put(loop.add_signal_handler.called)
 
 def test_register_system_signals():
     """Test if sanic register system signals"""
@@ -19,11 +27,11 @@ def test_register_system_signals():
     async def hello_route(request):
         return HTTPResponse()
 
-    loop = asyncio.new_event_loop()
-    loop.add_signal_handler = MagicMock()
-    asyncio.ensure_future(stop(app), loop=loop)
-    app.run(HOST, PORT, loop=loop)
-    assert loop.add_signal_handler.called == True
+    app.run(HOST, PORT,
+            before_start=set_loop,
+            after_start=stop,
+            after_stop=after)
+    assert calledq.get() == True
 
 
 def test_dont_register_system_signals():
@@ -34,8 +42,9 @@ def test_dont_register_system_signals():
     async def hello_route(request):
         return HTTPResponse()
 
-    loop = asyncio.new_event_loop()
-    loop.add_signal_handler = MagicMock()
-    asyncio.ensure_future(stop(app), loop=loop)
-    app.run(HOST, PORT, loop=loop, register_sys_signals=False)
-    assert loop.add_signal_handler.called == False
+    app.run(HOST, PORT,
+            before_start=set_loop,
+            after_start=stop,
+            after_stop=after,
+            register_sys_signals=False)
+    assert calledq.get() == False