Add FT test for bytes from list

Author: eendebakpt

Lib/test/test_free_threading/test_bytes_object.py

@@ -0,0 +1,37 @@
+import unittest
+import sys
+from threading import Thread, Barrier
+from test.support import threading_helper
+
+threading_helper.requires_working_threading(module=True)
+
+class BytesThreading(unittest.TestCase):
+
+    @threading_helper.reap_threads
+    def test_conversion_from_list(self):
+        number_of_threads = 10
+        number_of_iterations = 10
+        barrier = Barrier(number_of_threads)
+
+        x = [1, 2, 3, 4, 5]
+        e = [ (ii,)*(2+4*ii) for ii in range(number_of_threads)] # range of sizes to extend
+        def work(ii):
+            barrier.wait()
+            for _ in range(1000):
+                bytes(x)
+                x.extend(e[ii])
+                if len(x) > 10:
+                    x[:] = [0]
+
+        for it in range(number_of_iterations):
+            worker_threads = []
+            for ii in range(number_of_threads):
+                worker_threads.append(
+                    Thread(target=work, args=[ii]))
+            with threading_helper.start_threads(worker_threads):
+                pass
+
+            barrier.reset()
+
+if __name__ == "__main__":
+    unittest.main()