You got mistaken somewhere (or, as usual, in many places).

Test case 1 asks us to multiply (47,71) by 8 modulo 223 (with a=0, b=7). However with this prime the curve has structure 42x6, it is noncyclic.  Point (47,71) is from the group of (7,166); while (49,71) is from the group of (8,127). So, you could never reach either point from the other one.

You might want to change the test. If you insist on modulo 223, then b=5 is a good choice. Otherwise (b=7) use modulo 67 or 79, they are a bit like p and n in secp256k1, modulo one of them the group size is the other.