RE: Testing WHIVE/UNISWAP
Uniswap will use WHIVE to ETH pair and then ETH to WBTC automatically. To get BTC from WBTC, you can use coinlist.co: https://coinlist.co/help/how-do-i-redeem-wrapped-bitcoin-wbtc-for-btc
RE: Testing WHIVE/UNISWAP