public void First_With_Empty_Must_Throw(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
// Act
Action action = () => _ = ValueReadOnlyCollection
.First <Wrap.ValueReadOnlyCollection <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = action.Must()
.Throw <InvalidOperationException>()
.EvaluateTrue(exception => exception.Message == "Sequence contains no elements");
}
public void First_With_Empty_Must_Return_None(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
// Act
var result = ValueReadOnlyCollection
.First <Wrap.ValueReadOnlyCollection <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = result.Must()
.BeOfType <Option <int> >()
.EvaluateTrue(option => option.IsNone);
}
public void First_With_ValidData_Must_Succeed(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
var expected =
System.Linq.Enumerable.First(source);
// Act
var result = ValueReadOnlyCollection
.First <Wrap.ValueReadOnlyCollection <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = result.Must()
.BeEqualTo(expected);
}
public void First_With_ValidData_Must_Return_Some(int[] source)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
var expected =
System.Linq.Enumerable.First(source);
// Act
var result = ValueReadOnlyCollection
.First <Wrap.ValueReadOnlyCollection <int>, Wrap.Enumerator <int>, int>(wrapped);
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected),
() => throw new Exception());
}