ZOS_[3].js

# create logic contract
let myContract1 = await MyContract1.new()
# create a proxy which reference the logic contract
let proxy = await AdminUpgradeabilityProxy.new(myContract1.address)

# wrap proxy with the contract API
var wrapper = await MyContract1.at(proxy.address)
# initialize the contract
await wrapper.initialize(42)
console.log(await wrapper.value()) // 42

# create new logic contract
let myContract2 = await MyContract2.new()
# upgrade proxy to refer to the latest version
await proxy.upgradeTo(myContract2.address)
# use API of the new contract version
wrapper = await MyContract2.at(proxy.address)

await wrapper.add(1);
console.log(await wrapper.value()) // 43