public async Task SingleYieldBreakReturnsEmptySequence()
{
IAsyncEnumerator <int> enumerator = SingleYieldBreak();
int[] items = await enumerator.ToArray().ConfigureAwait(true);
items.Should().BeEmpty();
async IAsyncEnumerator <int> SingleYieldBreak() => await AsyncYield.Break <int>();
}
public void ItemExceptionIsPropagated()
{
IAsyncEnumerator <int> enumerator = TaskAsyncEnumerator.Create
(
Task.FromResult(42),
Task.FromException <int>(new InvalidOperationException())
);
Func <Task <int[]> > faultyAct = () => enumerator.ToArray();
faultyAct.ShouldThrow <InvalidOperationException>();
}
public async Task ReturnsItemsInOrder()
{
Task <int>[] itemTasks = new Task <int>[]
{
Task.FromResult(42),
Task.Delay(100).ContinueWith(_ => 64),
Task.FromResult(128)
};
IAsyncEnumerator <int> enumerator = TaskAsyncEnumerator.Create(itemTasks);
int[] array = await enumerator.ToArray().ConfigureAwait(true);
int[] expectedItems = await Task.WhenAll(itemTasks).ConfigureAwait(true);
array.Should().HaveEquivalentItems(expectedItems);
}
