What to do when your partner wont get tested

Me n my husband have been ttc for well over a year now and ive had blood work done multiple times and my dr says im healthy. The dr has given me referrals for my husband to get his sperm tested and each time he says he'll do it and then he changes his mind. Im trying to have faith and trust in God for his will n timing but im getting very frustrated! What do I do?