add uncle tests
add uncle tests

shahankhatch/solidity,douglas-larocca/solidity,ruchevits/solidity,chriseth/solidity-doc-test,ethers/solidity,ruchevits/solidity,vaporry/solidity,LianaHus/solidity,gluk256/solidity,ruchevits/solidity,chriseth/solidity,arkpar/solidity,ruchevits/solidity,debris/solidity