move test_aiter_callable_errors out from under requires_working_socket

It does not use the event loop, so the tearDown assertion that the
loop was used fails when it stays in AsyncGenAsyncioTest.

Author: graingert

Lib/test/test_asyncgen.py

@@ -617,6 +617,16 @@ async def gen():
         applied_twice = aiter(applied_once)
         self.assertIs(applied_once, applied_twice)
 
+    def test_aiter_callable_errors(self):
+        async def gen():
+            yield 1
+        self.assertRaises(TypeError, aiter, gen(), 1)
+        self.assertRaises(TypeError, aiter, [1, 2], stop_exception=LookupError)
+        self.assertRaises(TypeError, aiter, len, stop_exception=42)
+        self.assertRaises(TypeError, aiter, len,
+                          stop_exception=(LookupError, 42))
+        self.assertRaises(TypeError, aiter, len, stop_exception=LookupError())
+
     def test_anext_iter(self):
         class MyError(Exception):
             pass
@@ -1119,16 +1129,6 @@ async def main():
         self.loop.run_until_complete(main())
         self.assertEqual(cancelled, [1])
 
-    def test_aiter_callable_errors(self):
-        async def gen():
-            yield 1
-        self.assertRaises(TypeError, aiter, gen(), 1)
-        self.assertRaises(TypeError, aiter, [1, 2], stop_exception=LookupError)
-        self.assertRaises(TypeError, aiter, len, stop_exception=42)
-        self.assertRaises(TypeError, aiter, len,
-                          stop_exception=(LookupError, 42))
-        self.assertRaises(TypeError, aiter, len, stop_exception=LookupError())
-
     def test_anext_bad_args(self):
         async def gen():
             yield 1