public void Select_With_NullSelector_Must_Throw()
{
// Arrange
var collection = Wrap.AsValueReadOnlyCollection(new int[0]);
var selector = (NullableSelector <int, string>)null;
// Act
Action action = () => _ = ValueReadOnlyCollectionExtensions.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(collection, selector);
// Assert
_ = action.Must()
.Throw <ArgumentNullException>()
.EvaluateTrue(exception => exception.ParamName == "selector");
}
public void First_SelectorAt_With_Empty_Must_Return_None(int[] source, NullableSelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.First();
// Assert
_ = result.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
}
public void Select_With_ValidData_Must_Succeed(int[] source, Func <int, string> selector)
{
// Arrange
var wrapped = Wrap.AsValueReadOnlyCollection(source);
var expected =
System.Linq.Enumerable.Select(wrapped, selector);
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector);
// Assert
_ = result.Must()
.BeEnumerableOf <string>()
.BeEqualTo(expected);
}
public void First_Selector_With_ValidData_Must_Return_Some(int[] source, NullableSelector <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
var expected = Enumerable
.Select(source, selector.AsFunc())
.First();
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.First();
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected),
() => throw new Exception());
}
public void ToArray_Predicate_With_ValidData_Must_Succeed(int[] source, NullableSelector <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
var expected =
System.Linq.Enumerable.ToArray(
System.Linq.Enumerable.Select(source, selector.AsFunc()));
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ToArray();
// Assert
_ = result.Must()
.BeArrayOf <string>()
.BeEqualTo(expected);
}
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
.AsValueReadOnlyCollection(source);
var expected = Enumerable
.Select(source, selector)
.ToArray();
// Act
using var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ToArray(pool);
// Assert
_ = result.Memory
.SequenceEqual(expected);
}
public void ToList_SelectorAt_With_ValidData_Must_Succeed(int[] source, NullableSelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
var expected = Enumerable
.Select(source, selector.AsFunc())
.ToList();
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ToList();
// Assert
_ = result.Must()
.BeOfType <List <string> >()
.BeEnumerableOf <string>()
.BeEqualTo(expected);
}
public void ElementAt_Selector_With_ValidData_Must_Return_Some(int[] source, Func <int, string> selector)
{
// Arrange
var wrapped = Wrap.AsValueReadOnlyCollection(source);
var expected = Enumerable
.Select(source, selector)
.ToList();
for (var index = 0; index < source.Length; index++)
{
// Act
var result = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <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_Selector_With_OutOfRange_Must_Return_None(int[] source, Func <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsValueReadOnlyCollection(source);
// Act
var optionNegative = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <int>, Wrap.Enumerator <int>, int, string>(wrapped, selector)
.ElementAt(-1);
var optionTooLarge = ValueReadOnlyCollectionExtensions
.Select <Wrap.ValueReadOnlyCollectionWrapper <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);
}
