public void WhereWhenNotEmpty()
{
var numbers = new[] { 1, 2, 3 };
var numbersGreaterThanOne = MyEnumerable.Where(numbers, (n, i) => i > 0);
Assert.That(numbersGreaterThanOne, Is.EquivalentTo(new[] { 2, 3 }));
}
public void WhereWhenEmpty()
{
var numbers = new List <Int32>();
var allNumbers = MyEnumerable.Where(numbers, (n, i) => i >= 0);
Assert.That(allNumbers, Is.Empty);
}
public void WhereWhenEmpty()
{
var numbers = new List <Int32>();
var numbersGreaterThanFive = MyEnumerable.Where(numbers, n => n > 5);
Assert.That(numbersGreaterThanFive, Is.Empty);
}
private static void UseMyEnumerable()
{
var e = new MyEnumerable();
var q2 = e.Where(x => x % 2 == 0);
var q3 = q2.Select(x => x * x);
foreach (var val in q3)
{
Console.WriteLine($"{val}");
}
}
public void ThrowsWhenPredicateIsNull()
{
IEnumerable <Int32> source = new[] { 1, 2, 3 };
Assert.Throws <ArgumentNullException>(() => MyEnumerable.Where(source, (Func <Int32, Int32, Boolean>)null));
}
public void ThrowsWhenSourceIsNull()
{
IEnumerable <Int32> source = null;
Assert.Throws <ArgumentNullException>(() => MyEnumerable.Where(source, (n, i) => i > 0));
}