public void Select_With_NullSelector_Must_Throw()
{
// Arrange
var enumerable = Wrap.AsValueEnumerable(new int[0]);
var selector = (NullableSelectorAt <int, string>)null;
// Act
Action action = () => _ = ValueEnumerableExtensions.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(enumerable, selector);
// Assert
_ = action.Must()
.Throw <ArgumentNullException>()
.EvaluateTrue(exception => exception.ParamName == "selector");
}
public void Select_With_ValidData_Must_Succeed(int[] source, Func <int, int, string> selector)
{
// Arrange
var wrapped = Wrap.AsValueEnumerable(source);
var expected =
System.Linq.Enumerable.Select(wrapped, selector);
// Act
var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector);
// Assert
_ = result.Must()
.BeEnumerableOf <string>()
.BeEqualTo(expected);
}
public void Single_SelectorAt_With_Multiple_Must_Return_None(int[] source, Func <int, int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
// Act
var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.Single();
// Assert
_ = result.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
}
public void ToArray_SelectorAt_MemoryPool_With_ValidData_Must_Succeed(int[] source, Func <int, int, string> selector)
{
// Arrange
var pool = MemoryPool <string> .Shared;
var wrapped = Wrap
.AsValueEnumerable(source);
var expected = Enumerable
.Select(source, selector)
.ToArray();
// Act
using var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ToArray(pool);
// Assert
_ = result.Memory
.SequenceEqual(expected);
}
public void ToArray_SelectorAt_With_ValidData_Must_Succeed(int[] source, NullableSelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
var expected = Enumerable
.Select(source, selector.AsFunc())
.ToArray();
// Act
var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ToArray();
// Assert
_ = result.Must()
.BeArrayOf <string>()
.BeEqualTo(expected);
}
public void Single_SelectorAt_With_Single_Must_Return_Some(int[] source, Func <int, int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
var expected = Enumerable
.Select(source, selector)
.Single();
// Act
var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.Single();
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected),
() => throw new Exception());
}
public void ElementAt_SelectorAt_With_ValidData_Must_Return_Some(int[] source, Func <int, int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
var expected = Enumerable
.Select(source, selector)
.ToList();
for (var index = 0; index < source.Length; index++)
{
// Act
var result = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ElementAt(index);
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected[index]),
() => throw new Exception());
}
}
public void ElementAt_SelectorAt_With_OutOfRange_Must_Return_None(int[] source, Func <int, int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueEnumerable(source);
// Act
var optionNegative = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ElementAt(-1);
var optionTooLarge = ValueEnumerableExtensions
.Select <Wrap.ValueEnumerableWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ElementAt(source.Length);
// Assert
_ = optionNegative.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
_ = optionTooLarge.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
}