public async ValueTask ContainsAsync_SelectorAt_With_Comparer_And_NotContains_Must_ReturnFalse(int[] source, SelectorAt <int, string> selector)
{
// Arrange
var value = "!";
var wrapped = Wrap.AsAsyncValueEnumerable(source);
// Act
var result = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ContainsAsync(value, EqualityComparer <string> .Default);
// Assert
_ = result.Must()
.BeFalse();
}
public async void FirstAsync_SelectorAt_With_Empty_Must_Return_None(int[] source, SelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsAsyncValueEnumerable(source);
// Act
var result = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.FirstAsync();
// Assert
_ = result.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
}
public async ValueTask ContainsAsync_SelectorAt_With_Null_And_Contains_Must_ReturnFalse(int[] source, SelectorAt <int, string> selector)
{
// Arrange
var value =
System.Linq.Enumerable.Last(
System.Linq.Enumerable.Select(source, selector.AsFunc()));
var wrapped = Wrap.AsAsyncValueEnumerable(source);
// Act
var result = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ContainsAsync(value, null);
// Assert
_ = result.Must()
.BeTrue();
}
public async ValueTask ToArrayAsync_Selector_With_ValidData_Must_Succeed(int[] source, Selector <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsAsyncValueEnumerable(source);
var expected =
System.Linq.Enumerable.ToArray(
System.Linq.Enumerable.Select(source, selector.AsFunc()));
// Act
var result = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ToArrayAsync();
// Assert
_ = result.Must()
.BeArrayOf <string>()
.BeEqualTo(expected);
}
public async ValueTask FirstAsync_SelectorAt_With_ValidData_Must_Return_Some(int[] source, SelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap
.AsAsyncValueEnumerable(source);
var expected =
System.Linq.Enumerable.First(
System.Linq.Enumerable.Select(source, selector.AsFunc()));
// Act
var result = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.FirstAsync();
// Assert
_ = result.Match(
value => value.Must().BeEqualTo(expected),
() => throw new Exception());
}
public async ValueTask ForEachAsync_Action_Selector_With_ValidData_Must_Succeed(int[] source, Selector <int, string> selector)
{
// Arrange
var wrapped = Wrap.AsAsyncValueEnumerable(source);
var result = new List <string>();
var expected = new List <string>();
System.Linq.EnumerableEx.ForEach(
System.Linq.Enumerable.Select(source, selector.AsFunc()), item => expected.Add(item));
// Act
await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ForEachAsync((item, cancellationToken) => { result.Add(item); return(new ValueTask()); });
// Assert
_ = result.Must()
.BeEnumerableOf <string>()
.BeEqualTo(expected);
}
public async void ElementAtAsync_SelectorAt_With_OutOfRange_Must_Return_None(int[] source, SelectorAt <int, string> selector)
{
// Arrange
var wrapped = Wrap.AsAsyncValueEnumerable(source);
// Act
var optionNegative = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ElementAtAsync(-1);
var optionTooLarge = await AsyncValueEnumerable
.Select <Wrap.AsyncValueEnumerable <int>, Wrap.AsyncEnumerator <int>, int, string>(wrapped, selector.AsAsync())
.ElementAtAsync(source.Length);
// Assert
_ = optionNegative.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
_ = optionTooLarge.Must()
.BeOfType <Option <string> >()
.EvaluateTrue(option => option.IsNone);
}