public void GivenKeepMin2Items_AddInReverseOrder_ShouldHold3Not4()
{
_intHeap = BinaryMinHeap <int> .CreateWithSizeLimit(new IntComparer(), 2);
Assert.AreEqual(0, _intHeap.Add(4));
Assert.AreEqual(0, _intHeap.Add(3));
Assert.AreEqual(0, _intHeap.Add(2));
// level 2 is now full, should discard on next add
Assert.AreEqual(4, _intHeap.Add(1));
}