world = {
const world = new World(await MetaMaskEnv())
await world.env.read(github(`networks/${network}.json`))
await world.env.load(contractsJSON)
await world.env.assign({
LINK: '0x514910771af9ca656af840dff83e8264ecf986ca',
KNC: '0xdd974d5c2e2928dea5f71b9825b8b646686bd200'
})
return world;
}