Speaking of the testnet bitcoins, the wallet address posted by the OP start with "mk" not even 1. Does this mean there's a particular wallet which are use for the testnet bitcoin or every BTC wallet are good to go?
You'll need to simply run bitcoin core with testnet=1 (edit bitcoin.conf), and then it'll generate testnet adresses, (which have a different prefix.)
With electrum you also simply add --testnet as a parameter and it should start in testnet mode. (Newer versions of electrum automatically come with a shortcut for testnet, on windows at least.)