Coverage fix.

Author: Tinche

tests/multiloop/test_alternative_loops.py

@@ -17,6 +17,8 @@ def test_forbid_global_loop(event_loop):
     yield from asyncio.sleep(0.01, loop=event_loop)
     with pytest.raises(Exception):
         asyncio.get_event_loop()
+    with pytest.raises(Exception):
+        asyncio.set_event_loop(None)
 
 @pytest.mark.asyncio
 @asyncio.coroutine

tests/test_simple.py

@@ -8,6 +8,7 @@
 
 @asyncio.coroutine
 def async_coro(loop):
+    """A very simple coroutine."""
     yield from asyncio.sleep(0, loop=loop)
     return 'ok'
 

tests/test_simple_35.py

@@ -63,8 +63,8 @@ async def run_test():
         for port in port1, port2, port3:
             with pytest.raises(IOError):
                 await asyncio.start_server(closer, host='localhost',
-                                            port=port,
-                                            loop=event_loop)
+                                           port=port,
+                                           loop=event_loop)
 
         server1.close()
         await server1.wait_closed()