make delegating generators say they running (closes #14220)
diff --git a/Lib/test/test_pep380.py b/Lib/test/test_pep380.py
index 3a1db29..bdcfacd 100644
--- a/Lib/test/test_pep380.py
+++ b/Lib/test/test_pep380.py
@@ -847,6 +847,78 @@
yield from ()
self.assertRaises(StopIteration, next, g())
+ def test_delegating_generators_claim_to_be_running(self):
+ # Check with basic iteration
+ def one():
+ yield 0
+ yield from two()
+ yield 3
+ def two():
+ yield 1
+ try:
+ yield from g1
+ except ValueError:
+ pass
+ yield 2
+ g1 = one()
+ self.assertEqual(list(g1), [0, 1, 2, 3])
+ # Check with send
+ g1 = one()
+ res = [next(g1)]
+ try:
+ while True:
+ res.append(g1.send(42))
+ except StopIteration:
+ pass
+ self.assertEqual(res, [0, 1, 2, 3])
+ # Check with throw
+ class MyErr(Exception):
+ pass
+ def one():
+ try:
+ yield 0
+ except MyErr:
+ pass
+ yield from two()
+ try:
+ yield 3
+ except MyErr:
+ pass
+ def two():
+ try:
+ yield 1
+ except MyErr:
+ pass
+ try:
+ yield from g1
+ except ValueError:
+ pass
+ try:
+ yield 2
+ except MyErr:
+ pass
+ g1 = one()
+ res = [next(g1)]
+ try:
+ while True:
+ res.append(g1.throw(MyErr))
+ except StopIteration:
+ pass
+ # Check with close
+ class MyIt(object):
+ def __iter__(self):
+ return self
+ def __next__(self):
+ return 42
+ def close(self_):
+ self.assertTrue(g1.gi_running)
+ self.assertRaises(ValueError, next, g1)
+ def one():
+ yield from MyIt()
+ g1 = one()
+ next(g1)
+ g1.close()
+
def test_main():
from test import support