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"""Misc defaultdict tests.
Made for Jython.
"""
import pickle
import time
import threading
import unittest
from collections import defaultdict
from test import test_support
from random import randint
from java.util.concurrent.atomic import AtomicInteger
class PickleTestCase(unittest.TestCase):
def test_pickle(self):
d = defaultdict(str, a='foo', b='bar')
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
self.assertEqual(pickle.loads(pickle.dumps(d, proto)), d)
# TODO push into test_support or some other common module - run_threads
# is originally from test_list_jy.py
class ThreadSafetyTestCase(unittest.TestCase):
def run_threads(self, f, num=10):
threads = []
for i in xrange(num):
t = threading.Thread(target=f)
t.start()
threads.append(t)
timeout = 10. # be especially generous
for t in threads:
t.join(timeout)
timeout = 0.
for t in threads:
self.assertFalse(t.isAlive())
def test_inc_dec(self):
class Counter(object):
def __init__(self):
self.atomic = AtomicInteger()
# waiting is important here to ensure that
# defaultdict factories can step on each other
time.sleep(0.001)
def decrementAndGet(self):
return self.atomic.decrementAndGet()
def incrementAndGet(self):
return self.atomic.incrementAndGet()
def get(self):
return self.atomic.get()
def __repr__(self):
return "Counter<%s>" % (self.atomic.get())
counters = defaultdict(Counter)
size = 17
def tester():
for i in xrange(1000):
j = (i + randint(0, size)) % size
counters[j].decrementAndGet()
time.sleep(0.0001)
counters[j].incrementAndGet()
self.run_threads(tester, 20)
for i in xrange(size):
self.assertEqual(counters[i].get(), 0, counters)
def test_main():
test_support.run_unittest(PickleTestCase, ThreadSafetyTestCase)
if __name__ == '__main__':
test_main()
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