And at the moment is already possible to testnet the wallet, the miner and the daemon!
https://forum.decred.org/threads/guide-how-i-got-my-daemon-wallet-and-miner-running-on-testnet-also-started-solo-stake-mining.352/page-10#post-6133

On this step-by-step guide you will find all you need to setup in order to be ready at launch day