add zero memory expansion tests
add zero memory expansion tests

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