Fix #1203: Create CookieJar without explicit loop passing

CHANGES.rst

@@ -8,7 +8,7 @@ CHANGES
 
 - Add missing `WSMsgType` to `web_ws.__all__`, see #1200
 
--
+- Fix `CookieJar` ctor when called with `loop=None` #1203
 
 -
 

aiohttp/cookiejar.py

@@ -33,7 +33,7 @@ def __init__(self, *, unsafe=False, loop=None):
         self._cookies = defaultdict(SimpleCookie)
         self._host_only_cookies = set()
         self._unsafe = unsafe
-        self._next_expiration = ceil(loop.time())
+        self._next_expiration = ceil(self._loop.time())
         self._expirations = {}
 
     def clear(self):

tests/test_cookiejar.py

@@ -140,6 +140,12 @@ def test_constructor(loop, cookies_to_send, cookies_to_receive):
     assert jar._loop is loop
 
 
+def test_ctor_ith_default_loop(loop):
+    asyncio.set_event_loop(loop)
+    jar = CookieJar()
+    assert jar._loop is loop
+
+
 def test_domain_filter_ip_cookie_send(loop):
     jar = CookieJar(loop=loop)
     cookies = SimpleCookie(