public void TestEmpty()
{
Assert.IsFalse(aabbOne.IsEmpty());
Assert.IsFalse(aabbHalf.IsEmpty());
Assert.IsFalse(aabbZeroTwo.IsEmpty());
Assert.IsFalse(aabbOneTwo.IsEmpty());
AABB2D aabb = new AABB2D(new Vector2(1f, 2f), new Vector2(-1f, -2f));
Assert.IsTrue(aabb.IsEmpty());
aabb.Valid();
Assert.IsFalse(aabb.IsEmpty());
Assert.AreEqual(aabb.min, new Vector2(-1f, -2f));
Assert.AreEqual(aabb.max, new Vector2(1f, 2f));
}