Add test for the new AsyncGenerator support. Close #2379

pylint/test/functional/iterable_context_py36.py

@@ -1,5 +1,5 @@
 # pylint: disable=missing-docstring,too-few-public-methods,unused-variable
-
+import asyncio
 
 class AIter:
     async def __aiter__(self):
@@ -13,3 +13,16 @@ async def to_list(self):
             yield value
         async for value in self:
             yield value
+
+
+async def some_iter_func(number):
+    """ emits 1 number per second  """
+    for i in range(1, number):
+        yield i
+        await asyncio.sleep(1)
+
+
+async def count_to(number):
+    """ counts to n in async manner"""
+    async for i in some_iter_func(number):
+        print(i)