public async Task AttemptingToAppendASingleElementToANullSequenceThrowsArgumentNullException()
{
IAsyncEnumerable <string> source = null;
source.ShouldBeNull();
await source.AppendAsync("Hello, World!")
.ConsumeAsync()
.ShouldThrowAsync <ArgumentNullException>();
}
public async Task AttemptingToAppendANonNullSequenceToANullSequenceThrowsArgumentNullException()
{
IAsyncEnumerable <int> source = null;
int[] additional = { 0, 2, 4, 6, 8 };
source.ShouldBeNull();
additional.ShouldNotBeNull();
additional.ShouldBeAssignableTo <IEnumerable <int> >();
await source.AppendAsync(additional)
.ConsumeAsync()
.ShouldThrowAsync <ArgumentNullException>();
}
