public void TestFindIndex()
{
List <int> data = new List <int>(Enumerable.Range(0, 100));
var arrayData = data.ToArray();
var enumWrapper = new EnumerableWrapper <int>(data);
for (int i = -1; i < 100; i++)
{
int expected = data.FindIndex(v => v == i);
Assert.AreEqual(expected, (data as IEnumerable <int>).FindIndex(v => v == i));
Assert.AreEqual(expected, (arrayData as IEnumerable <int>).FindIndex(v => v == i));
Assert.AreEqual(expected, enumWrapper.FindIndex(v => v == i));
}
}
