def test_basic_operations(self):
c = CounterCell()
c.inc(2)
self.assertEqual(c.get_cumulative(), 2)
c.dec(10)
self.assertEqual(c.get_cumulative(), -8)
c.dec()
self.assertEqual(c.get_cumulative(), -9)
c.inc()
self.assertEqual(c.get_cumulative(), -8)
def test_basic_operations(self):
c = CounterCell()
c.inc(2)
self.assertEqual(c.get_cumulative(), 2)
c.dec(10)
self.assertEqual(c.get_cumulative(), -8)
c.dec()
self.assertEqual(c.get_cumulative(), -9)
c.inc()
self.assertEqual(c.get_cumulative(), -8)
def test_parallel_access(self):
# We create NUM_THREADS threads that concurrently modify the counter.
threads = []
c = CounterCell()
for _ in range(TestCounterCell.NUM_THREADS):
t = threading.Thread(target=TestCounterCell._modify_counter,
args=(c,))
threads.append(t)
t.start()
for t in threads:
t.join()
total = (self.NUM_ITERATIONS * (self.NUM_ITERATIONS-1)/2 * self.NUM_THREADS)
self.assertEqual(c.get_cumulative(), total)
def test_parallel_access(self):
# We create NUM_THREADS threads that concurrently modify the counter.
threads = []
c = CounterCell()
for _ in range(TestCounterCell.NUM_THREADS):
t = threading.Thread(target=TestCounterCell._modify_counter,
args=(c, ))
threads.append(t)
t.start()
for t in threads:
t.join()
total = (self.NUM_ITERATIONS * (self.NUM_ITERATIONS - 1) // 2 *
self.NUM_THREADS)
self.assertEqual(c.get_cumulative(), total)