private static void AssertCollectionContainsExactlyUnordered(CopyOnWriteCollection <int> collection, IEnumerable <int> expectedItems)
{
foreach (var item in expectedItems)
{
Assert.True(collection.TryRemove(item));
}
Assert.Equal(0, collection.Count);
}
public void TryRemoveShouldReturnTrueForKnownItem()
{
var knownItems = Enumerable.Range(0, 5).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(knownItems);
Assert.True(collection.TryRemove(knownItems[2]));
}
public void TryRemoveShouldReturnFalseForUnknownItem()
{
const int unknownItem = -1;
var knownItems = Enumerable.Range(0, 5).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(knownItems);
Assert.False(collection.TryRemove(unknownItem));
}
public void TryRemoveOfLastItemShouldEmptyTheArray()
{
var collection = new CopyOnWriteCollection <int>();
const int lastItem = 3;
collection.AddRange(new[] { lastItem });
collection.TryRemove(lastItem);
Assert.Equal(new int[0], collection.Snapshot);
}
public void TryRemoveShouldDecrementCountForKnownItem()
{
var knownItems = Enumerable.Range(0, 5).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(knownItems);
collection.TryRemove(knownItems[2]);
Assert.Equal(knownItems.Length - 1, collection.Count);
}
public void TryRemoveShouldRemoveKnownItem()
{
var knownItems = Enumerable.Range(0, 5).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(knownItems);
collection.TryRemove(knownItems[2]);
Assert.DoesNotContain(knownItems[2], collection.Snapshot);
}
public void TryRemoveShouldNotChangeCountForUnknownItem()
{
const int unknownItem = -1;
var knownItems = Enumerable.Range(0, 5).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(knownItems);
collection.TryRemove(unknownItem);
Assert.Equal(knownItems.Length, collection.Count);
}
public void TryRemoveShouldAllowParallelCalls()
{
const int nrOfParallelOperations = 100;
var items = Enumerable.Range(0, nrOfParallelOperations).ToArray();
var collection = new CopyOnWriteCollection <int>();
collection.AddRange(items);
var tryRemoveActions = new Action[nrOfParallelOperations];
for (var i = 0; i < nrOfParallelOperations; i++)
{
var item = i;
tryRemoveActions[i] = () => collection.TryRemove(item);
}
Parallel.Invoke(tryRemoveActions);
Assert.Equal(0, collection.Count);
}
