And here is my steps:
1. Connect tablet with clover min, choose "USB Clover Connector";
2. Click "New Order" button, create a order choose "Sale", click "Continue";
3. Swipe the test card, click "Credit" button;
4. The screen show "TRANSACTION DECLINED: CHARGE DECLINED DECLINED NO REASON PROVIDED";
5. I also tested with my true credit card, it is working.
And my question is how can I make the test card working? Thank you!