public void SingleOrDefault_With_Multiple_Must_Throw(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
// Act
Action action = () => _ = ValueEnumerable
.SingleOrDefault <Wrap.ValueEnumerable <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = action.Must()
.Throw <InvalidOperationException>()
.EvaluateTrue(exception => exception.Message == "Sequence contains more than one element");
}
public void SingleOrDefault_With_EmptyOrSingle_Must_Succeed(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
var expected =
System.Linq.Enumerable.SingleOrDefault(source);
// Act
var result = ValueEnumerable
.SingleOrDefault <Wrap.ValueEnumerable <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = result.Must()
.BeEqualTo(expected);
}