add a fail scenario
add a fail scenario

ethereum/pyethereum,holiman/pyethereum,pipermerriam/pyethereum,shahankhatch/pyethereum,inzem77/pyethereum,shahankhatch/pyethereum,ckeenan/pyethereum,ddworken/pyethereum,karlfloersch/pyethereum,vaporry/pyethereum,jnnk/pyethereum,pipermerriam/pyethereum,ethermarket/pyethereum,ebuchman/daoist_protocol,ethers/pyethereum,ebuchman/daoist_protocol,karlfloersch/pyethereum,harlantwood/pyethereum,ethereum/pyethereum