public void miner_should_receive_a_reward_amount()
{
_sut.BalanceOf("some lucky miner").Should().Be(0);
var block = _sut.MakeBlock(EmptyTransactionList);
var mined = _sut.Mine(block, "some lucky miner");
var blockChain = _sut.Push(mined);
blockChain.BalanceOf("some lucky miner").Should().Be(RewardAmount);
}