public void FindIndexTest()
{
var a = new[] { new EClass(1), new EClass(2) };
var l = new EventedList <EClass>(a);
Assert.That(l.FindIndex(e => e.Prop == 2), Is.EqualTo(1));
Assert.That(l.FindIndex(e => e.Prop == 7), Is.EqualTo(-1));
Assert.That(l.FindIndex(1, 1, e => e.Prop == 2), Is.EqualTo(1));
}