public void FRect_FullyEncloses()
{
FRect A = new FRect(0, 0, 10, 10);
FRect B = new FRect(3, 3, 3, 3);
FRect C = new FRect(1, 1, 9, 9); // touching bottom and right
FRect D = new FRect(3, 3, 11, 11);
FRect E = new FRect(-1, -1, 10, 10);
Debug.Assert(!A.FullyEncloses(A));
Debug.Assert(A.FullyEncloses(B));
Debug.Assert(!A.FullyEncloses(C));
Debug.Assert(!A.FullyEncloses(D));
Debug.Assert(!A.FullyEncloses(E));
}