public void SingleOrDefaultAsync_With_Multiple_Must_Throw(int[] source)
{
// Arrange
var wrapped = Wrap
.AsAsyncValueEnumerable(source);
// Act
Func <ValueTask> action = async() => _ = await AsyncValueEnumerable
.SingleOrDefaultAsync <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int>(wrapped);
// Assert
_ = action.Must()
.Throw <InvalidOperationException>()
.EvaluateTrue(exception => exception.Message == "Sequence contains more than one element");
}
public async ValueTask SingleOrDefaultAsync_With_EmptyOrSingle_Must_Succeed(int[] source)
{
// Arrange
var wrapped = Wrap
.AsAsyncValueEnumerable(source);
var expected =
System.Linq.Enumerable.SingleOrDefault(source);
// Act
var result = await AsyncValueEnumerable
.SingleOrDefaultAsync <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int>(wrapped);
// Assert
_ = result.Must()
.BeEqualTo(expected);
}
