add test for pairwise

Author: eendebakpt

Lib/test/test_free_threading/test_itertools.py

@@ -1,5 +1,5 @@
 import unittest
-from itertools import batched, chain, combinations_with_replacement, cycle, permutations
+from itertools import batched, chain, combinations_with_replacement, cycle, pairwise, permutations
 from test.support import threading_helper
 
 
@@ -48,6 +48,13 @@ def test_combinations_with_replacement(self):
             it = combinations_with_replacement(tuple(range(2)), 2)
             threading_helper.run_concurrently(work_iterator, nthreads=6, args=[it])
 
+    @threading_helper.reap_threads
+    def test_pairwise(self):
+        number_of_iterations = 10
+        for _ in range(number_of_iterations):
+            it = pairwise(tuple(range(100)))
+            threading_helper.run_concurrently(work_iterator, nthreads=10, args=[it])
+
     @threading_helper.reap_threads
     def test_permutations(self):
         number_of_iterations = 6