pythongh-93814: Add infinite test for itertools.chain.from_iterable (p…

…ythonGH-93815)

fix python#93814

Automerge-Triggered-By: GH:rhettinger

Lib/test/test_itertools.py

@@ -180,6 +180,7 @@ def test_chain_from_iterable(self):
         self.assertEqual(list(chain.from_iterable([''])), [])
         self.assertEqual(take(4, chain.from_iterable(['abc', 'def'])), list('abcd'))
         self.assertRaises(TypeError, list, chain.from_iterable([2, 3]))
+        self.assertEqual(list(islice(chain.from_iterable(repeat(range(5))), 2)), [0, 1])
 
     def test_chain_reducible(self):
         for oper in [copy.deepcopy] + picklecopiers: