public void TestLastOrDefault()
{
var enumerated = new List <object>();
var enumerable = new LazayIdEnumerable <int>(new IntegerEnumerable(0, 3), id => { enumerated.Add(id); return((int)id); });
var result = enumerable.LastOrDefault();
Assert.AreEqual(1, enumerated.Count);
Assert.AreEqual(2, result);
}
public void TestCountAfterConcat()
{
var enumerated = new List <object>();
var result = new LazayIdEnumerable <int>(new IntegerEnumerable(0, 2), id => { enumerated.Add(id); return((int)id); })
.Concat(new LazayIdEnumerable <int>(new IntegerEnumerable(2, 2), id => { enumerated.Add(id); return((int)id); }))
.Count();
Assert.AreEqual(0, enumerated.Count);
Assert.AreEqual(4, result);
}
public void TestSkip()
{
var enumerated = new List <object>();
var enumerable = new LazayIdEnumerable <int>(new IntegerEnumerable(0, 3), id => { enumerated.Add(id); return((int)id); });
var result = enumerable.Skip(2)
.ToArray();
Assert.AreEqual(1, enumerated.Count);
Assert.AreEqual(1, result.Length);
Assert.AreEqual(2, result[0]);
}
public void TestConcat()
{
var enumerated = new List <object>();
var result = new LazayIdEnumerable <int>(new IntegerEnumerable(0, 2), id => { enumerated.Add(id); return((int)id); })
.Concat(new LazayIdEnumerable <int>(new IntegerEnumerable(2, 2), id => { enumerated.Add(id); return((int)id); }))
.ToArray();
Assert.AreEqual(4, enumerated.Count);
Assert.AreEqual(0, result[0]);
Assert.AreEqual(1, result[1]);
Assert.AreEqual(2, result[2]);
Assert.AreEqual(3, result[3]);
}
