Issue #24400, #24325: More tests for types._GeneratorWrapper

Also, make 'wrapped' and 'isgen' private.

Lib/test/test_types.py

@@ -1316,6 +1316,11 @@ class CoroutineTests(unittest.TestCase):
 
         wrapper.send(1)
         gen.send.assert_called_once_with(1)
+        gen.reset_mock()
+
+        next(wrapper)
+        gen.__next__.assert_called_once_with()
+        gen.reset_mock()
 
         wrapper.throw(1, 2, 3)
         gen.throw.assert_called_once_with(1, 2, 3)
@@ -1412,8 +1417,10 @@ class CoroutineTests(unittest.TestCase):
             self.fail('StopIteration was expected')
 
     def test_gen(self):
-        def gen(): yield
-        gen = gen()
+        def gen_func():
+            yield 1
+            return (yield 2)
+        gen = gen_func()
         @types.coroutine
         def foo(): return gen
         wrapper = foo()
@@ -1426,6 +1433,17 @@ class CoroutineTests(unittest.TestCase):
                           getattr(gen, name))
         self.assertIs(foo().cr_code, gen.gi_code)
 
+        self.assertEqual(next(wrapper), 1)
+        self.assertEqual(wrapper.send(None), 2)
+        with self.assertRaisesRegex(StopIteration, 'spam'):
+            wrapper.send('spam')
+
+        gen = gen_func()
+        wrapper = foo()
+        wrapper.send(None)
+        with self.assertRaisesRegex(Exception, 'ham'):
+            wrapper.throw(Exception, Exception('ham'))
+
     def test_genfunc(self):
         def gen(): yield
         self.assertIs(types.coroutine(gen), gen)

Lib/types.py

@@ -169,33 +169,33 @@ import collections.abc as _collections_abc
 class _GeneratorWrapper:
     # TODO: Implement this in C.
     def __init__(self, gen):
-        self.__wrapped__ = gen
-        self.__isgen__ = gen.__class__ is GeneratorType
+        self.__wrapped = gen
+        self.__isgen = gen.__class__ is GeneratorType
         self.__name__ = getattr(gen, '__name__', None)
         self.__qualname__ = getattr(gen, '__qualname__', None)
     def send(self, val):
-        return self.__wrapped__.send(val)
+        return self.__wrapped.send(val)
     def throw(self, tp, *rest):
-        return self.__wrapped__.throw(tp, *rest)
+        return self.__wrapped.throw(tp, *rest)
     def close(self):
-        return self.__wrapped__.close()
+        return self.__wrapped.close()
     @property
     def gi_code(self):
-        return self.__wrapped__.gi_code
+        return self.__wrapped.gi_code
     @property
     def gi_frame(self):
-        return self.__wrapped__.gi_frame
+        return self.__wrapped.gi_frame
     @property
     def gi_running(self):
-        return self.__wrapped__.gi_running
+        return self.__wrapped.gi_running
     cr_code = gi_code
     cr_frame = gi_frame
     cr_running = gi_running
     def __next__(self):
-        return next(self.__wrapped__)
+        return next(self.__wrapped)
     def __iter__(self):
-        if self.__isgen__:
-            return self.__wrapped__
+        if self.__isgen:
+            return self.__wrapped
         return self
     __await__ = __iter__