test_bytes_object.py

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()