public void List_ElementAt()
{
var list = new int[] { 3 };
Assert.AreEqual(3, ReadOnlyList.ElementAt(list, 0));
list = new int[] { 9, 3, 1 };
Assert.AreEqual(3, ReadOnlyList.ElementAt(list, 1));
}
public void ElementAt_With_OutOfRange_Must_Throw(int[] source, int index)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyList(source);
// Act
Action action = () => _ = ReadOnlyList
.ElementAt <Wrap.ValueReadOnlyList <int>, int>(wrapped, index);
// Assert
_ = action.Must()
.Throw <ArgumentOutOfRangeException>();
}
public void ElementAt_With_ValidData_Must_Succeed(int[] source, int index)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyList(source);
var expected =
System.Linq.Enumerable.ElementAt(wrapped, index);
// Act
var result = ReadOnlyList
.ElementAt <Wrap.ValueReadOnlyList <int>, int>(wrapped, index);
// Assert
_ = result.Must()
.BeEqualTo(expected);
}
public void ElementAt_With_ValidData_Must_Return_Some(int[] source)
{
for (var index = 0; index < source.Length; index++)
{
// Arrange
var wrapped = Wrap.AsValueReadOnlyList(source);
var expected =
System.Linq.Enumerable.ElementAt(source, index);
// Act
var result = ReadOnlyList
.ElementAt <Wrap.ValueReadOnlyList <int>, int>(wrapped, index);
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected),
() => throw new Exception());
}
}
public void ElementAt_With_OutOfRange_Must_Return_None(int[] source)
{
// Arrange
var wrapped = Wrap.AsValueReadOnlyList(source);
// Act
var optionNegative = ReadOnlyList
.ElementAt <Wrap.ValueReadOnlyList <int>, int>(wrapped, -1);
var optionTooLarge = ReadOnlyList
.ElementAt <Wrap.ValueReadOnlyList <int>, int>(wrapped, source.Length);
// Assert
_ = optionNegative.Must()
.BeOfType <Option <int> >()
.EvaluateTrue(option => option.IsNone);
_ = optionTooLarge.Must()
.BeOfType <Option <int> >()
.EvaluateTrue(option => option.IsNone);
}