how to test if my hash is valid for a stratum pool

[uray]

i am creating cpu bitcoin miner (with stratum) just for learning

i can test my sha256d function are correct by compared input and output to other well known function,
but my concern is, how to make sure that my share to pool is correct as pool requested (byte order, json format, etc..), currently i tested it on ghash.io pool, with minimal difficulty is 16, still i can't found a share since i am mining with cpu, is there a pool with minimal difficulty is 1 so i can test if pool can accept or reject my hash?

or is there any other scheme where i can test against ?