Test cards are on the portal when you go to recharge your account in test mode
When first integrating our APIs, its best to switch your account on test mode. Then go to recharge your balance-->make payment tab-->upper right corner click to view test cards.
In test mode you will receive an email with the verification amount to enter as the second step to activate the "test cards". Click and "verify" and enter the amount sent to your email. ONLY then can you add test BALANCE to your account.