Hello,
Please be sure that your test order is "confirmed" and have an invoice number.
HikaSubscription create the subscription on the order creation but that subscription become "active" only when the payment of the order is confirmed.
If you do use a manual payment method for the test such as "collect on delivery", you need to open the order in the HIkaShop backend and, in the order detail page, change its status.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.