bpo-32650: Add an asyncgen pdb test (#5406)

Author: 1st1

Lib/test/test_pdb.py

@@ -782,6 +782,66 @@ def test_pdb_next_command_for_coroutine():
     finished
     """
 
+def test_pdb_next_command_for_asyncgen():
+    """Testing skip unwindng stack on yield for coroutines for "next" command
+
+    >>> import asyncio
+
+    >>> async def agen():
+    ...     yield 1
+    ...     await asyncio.sleep(0)
+    ...     yield 2
+
+    >>> async def test_coro():
+    ...     async for x in agen():
+    ...         print(x)
+
+    >>> async def test_main():
+    ...     import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+    ...     await test_coro()
+
+    >>> def test_function():
+    ...     loop = asyncio.new_event_loop()
+    ...     loop.run_until_complete(test_main())
+    ...     loop.close()
+    ...     print("finished")
+
+    >>> with PdbTestInput(['step',
+    ...                    'step',
+    ...                    'next',
+    ...                    'next',
+    ...                    'step',
+    ...                    'next',
+    ...                    'continue']):
+    ...     test_function()
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[3]>(3)test_main()
+    -> await test_coro()
+    (Pdb) step
+    --Call--
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[2]>(1)test_coro()
+    -> async def test_coro():
+    (Pdb) step
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[2]>(2)test_coro()
+    -> async for x in agen():
+    (Pdb) next
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[2]>(3)test_coro()
+    -> print(x)
+    (Pdb) next
+    1
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[2]>(2)test_coro()
+    -> async for x in agen():
+    (Pdb) step
+    --Call--
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[1]>(2)agen()
+    -> yield 1
+    (Pdb) next
+    > <doctest test.test_pdb.test_pdb_next_command_for_asyncgen[1]>(3)agen()
+    -> await asyncio.sleep(0)
+    (Pdb) continue
+    2
+    finished
+    """
+
 def test_pdb_return_command_for_generator():
     """Testing no unwindng stack on yield for generators
        for "return" command