Last week somebody was mining on the testnet using an S9, compared to 13 Th, the couple Gh you get with your cpu won't give you high odds of hitting a testnet block.

The difficulty resets to 1 if a block is not found in 20 minutes, so you can CPU mine then. The difficulty can also be gamed to be set to 1 for an entire retarget period, and it can only increase at most by a factor of 4, so CPU mining is viable at those times.

By the way: testnet addresses start with m or n

Testnet P2SH addresses start with 2.