public void ManyConcurrentAddsTakes_ForceContentionWithGetEnumerator(int initialCount, double seconds)
{
IProducerConsumerCollection <int> c = CreateProducerConsumerCollection(Enumerable.Range(1, initialCount));
const int MaxCount = 4;
DateTime end = DateTime.UtcNow + TimeSpan.FromSeconds(seconds);
Task addsTakes = ThreadFactory.StartNew(() =>
{
while (DateTime.UtcNow < end)
{
for (int i = 1; i <= MaxCount; i++)
{
Assert.True(c.TryAdd(i));
}
for (int i = 1; i <= MaxCount; i++)
{
int item;
Assert.True(c.TryTake(out item));
Assert.InRange(item, 1, MaxCount);
}
}
});
while (DateTime.UtcNow < end)
{
int[] arr = c.Select(i => i).ToArray();
Assert.InRange(arr.Length, initialCount, MaxCount + initialCount);
Assert.DoesNotContain(0, arr); // make sure we didn't get default(T)
}
addsTakes.GetAwaiter().GetResult();
Assert.Equal(initialCount, c.Count);
}