uups-happy-path.js

const test = require('ava');

const { ethers, upgrades } = require('hardhat');

test.before(async t => {
  t.context.Greeter = await ethers.getContractFactory('GreeterProxiable');
  t.context.GreeterV2 = await ethers.getContractFactory('GreeterV2Proxiable');
  t.context.GreeterV3 = await ethers.getContractFactory('GreeterV3Proxiable');
});

test('happy path', async t => {
  const { Greeter, GreeterV2, GreeterV3 } = t.context;

  const greeter = await upgrades.deployProxy(Greeter, ['Hello, Hardhat!'], { kind: 'uups' });

  const greeter2 = await upgrades.upgradeProxy(greeter, GreeterV2);
  await greeter2.deployed();
  await greeter2.resetGreeting();

  const greeter3ImplAddr = await upgrades.prepareUpgrade(greeter.address, GreeterV3);
  const greeter3 = GreeterV3.attach(greeter3ImplAddr);
  const version3 = await greeter3.version();
  t.is(version3, 'V3');
});