openzeppelin-contracts/test/token/ERC721/extensions/ERC721Votes.test.js

/* eslint-disable */

const { expectEvent, time } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');

const ERC721VotesMock = artifacts.require('ERC721VotesMock');

const { shouldBehaveLikeVotes } = require('../../../governance/utils/Votes.behavior');

contract('ERC721Votes', function (accounts) {
  const [ account1, account2, account1Delegatee, other1, other2 ] = accounts;
  const name = 'My Vote';
  const symbol = 'MTKN';
  const tokens = [
    '10000000000000000000000000',
    '10',
    '20',
    '30',
  ].map(n => web3.utils.toBN(n));

  beforeEach(async function () {
    this.votes = await ERC721VotesMock.new(name, symbol);

    // We get the chain id from the contract because Ganache (used for coverage) does not return the same chain id
    // from within the EVM as from the JSON RPC interface.
    // See https://github.com/trufflesuite/ganache-core/issues/515
    this.chainId = await this.votes.getChainId();
  });

  describe('balanceOf', function () {
    beforeEach(async function () {
      await this.votes.mint(account1, tokens[0]);
      await this.votes.mint(account1, tokens[1]);
      await this.votes.mint(account1, tokens[2]);
      await this.votes.mint(account1, tokens[3]);
    });

    it('grants to initial account', async function () {
      expect(await this.votes.balanceOf(account1)).to.be.bignumber.equal('4');
    });
  });

  describe('transfers', function () {
    beforeEach(async function () {
      await this.votes.mint(account1, tokens[0]);
    });

    it('no delegation', async function () {
      const { receipt } = await this.votes.transferFrom(account1, account2, tokens[0], { from: account1 });
      expectEvent(receipt, 'Transfer', { from: account1, to: account2, tokenId: tokens[0] });
      expectEvent.notEmitted(receipt, 'DelegateVotesChanged');

      this.account1Votes = '0';
      this.account2Votes = '0';
    });

    it('sender delegation', async function () {
      await this.votes.delegate(account1, { from: account1 });

      const { receipt } = await this.votes.transferFrom(account1, account2, tokens[0], { from: account1 });
      expectEvent(receipt, 'Transfer', { from: account1, to: account2, tokenId: tokens[0] });
      expectEvent(receipt, 'DelegateVotesChanged', { delegate: account1, previousBalance: '1', newBalance: '0' });

      const { logIndex: transferLogIndex } = receipt.logs.find(({ event }) => event == 'Transfer');
      expect(receipt.logs.filter(({ event }) => event == 'DelegateVotesChanged').every(({ logIndex }) => transferLogIndex < logIndex)).to.be.equal(true);

      this.account1Votes = '0';
      this.account2Votes = '0';
    });

    it('receiver delegation', async function () {
      await this.votes.delegate(account2, { from: account2 });

      const { receipt } = await this.votes.transferFrom(account1, account2, tokens[0], { from: account1 });
      expectEvent(receipt, 'Transfer', { from: account1, to: account2, tokenId: tokens[0] });
      expectEvent(receipt, 'DelegateVotesChanged', { delegate: account2, previousBalance: '0', newBalance: '1' });

      const { logIndex: transferLogIndex } = receipt.logs.find(({ event }) => event == 'Transfer');
      expect(receipt.logs.filter(({ event }) => event == 'DelegateVotesChanged').every(({ logIndex }) => transferLogIndex < logIndex)).to.be.equal(true);

      this.account1Votes = '0';
      this.account2Votes = '1';
    });

    it('full delegation', async function () {
      await this.votes.delegate(account1, { from: account1 });
      await this.votes.delegate(account2, { from: account2 });

      const { receipt } = await this.votes.transferFrom(account1, account2, tokens[0], { from: account1 });
      expectEvent(receipt, 'Transfer', { from: account1, to: account2, tokenId: tokens[0] });
      expectEvent(receipt, 'DelegateVotesChanged', { delegate: account1, previousBalance: '1', newBalance: '0'});
      expectEvent(receipt, 'DelegateVotesChanged', { delegate: account2, previousBalance: '0', newBalance: '1' });

      const { logIndex: transferLogIndex } = receipt.logs.find(({ event }) => event == 'Transfer');
      expect(receipt.logs.filter(({ event }) => event == 'DelegateVotesChanged').every(({ logIndex }) => transferLogIndex < logIndex)).to.be.equal(true);

      this.account1Votes = '0';
      this.account2Votes = '1';
    });

    it('returns the same total supply on transfers', async function () {
      await this.votes.delegate(account1, { from: account1 });

      const { receipt } = await this.votes.transferFrom(account1, account2, tokens[0], { from: account1 });

      await time.advanceBlock();
      await time.advanceBlock();

      expect(await this.votes.getPastTotalSupply(receipt.blockNumber - 1)).to.be.bignumber.equal('1');
      expect(await this.votes.getPastTotalSupply(receipt.blockNumber + 1)).to.be.bignumber.equal('1');

      this.account1Votes = '0';
      this.account2Votes = '0';
    });

    it('generally returns the voting balance at the appropriate checkpoint', async function () {
      await this.votes.mint(account1, tokens[1]);
      await this.votes.mint(account1, tokens[2]);
      await this.votes.mint(account1, tokens[3]);

      const total = await this.votes.balanceOf(account1);

      const t1 = await this.votes.delegate(other1, { from: account1 });
      await time.advanceBlock();
      await time.advanceBlock();
      const t2 = await this.votes.transferFrom(account1, other2, tokens[0], { from: account1 });
      await time.advanceBlock();
      await time.advanceBlock();
      const t3 = await this.votes.transferFrom(account1, other2, tokens[2], { from: account1 });
      await time.advanceBlock();
      await time.advanceBlock();
      const t4 = await this.votes.transferFrom(other2, account1, tokens[2], { from: other2 });
      await time.advanceBlock();
      await time.advanceBlock();

      expect(await this.votes.getPastVotes(other1, t1.receipt.blockNumber - 1)).to.be.bignumber.equal('0');
      expect(await this.votes.getPastVotes(other1, t1.receipt.blockNumber)).to.be.bignumber.equal(total);
      expect(await this.votes.getPastVotes(other1, t1.receipt.blockNumber + 1)).to.be.bignumber.equal(total);
      expect(await this.votes.getPastVotes(other1, t2.receipt.blockNumber)).to.be.bignumber.equal('3');
      expect(await this.votes.getPastVotes(other1, t2.receipt.blockNumber + 1)).to.be.bignumber.equal('3');
      expect(await this.votes.getPastVotes(other1, t3.receipt.blockNumber)).to.be.bignumber.equal('2');
      expect(await this.votes.getPastVotes(other1, t3.receipt.blockNumber + 1)).to.be.bignumber.equal('2');
      expect(await this.votes.getPastVotes(other1, t4.receipt.blockNumber)).to.be.bignumber.equal('3');
      expect(await this.votes.getPastVotes(other1, t4.receipt.blockNumber + 1)).to.be.bignumber.equal('3');

      this.account1Votes = '0';
      this.account2Votes = '0';
    });

    afterEach(async function () {
      expect(await this.votes.getVotes(account1)).to.be.bignumber.equal(this.account1Votes);
      expect(await this.votes.getVotes(account2)).to.be.bignumber.equal(this.account2Votes);

      // need to advance 2 blocks to see the effect of a transfer on "getPastVotes"
      const blockNumber = await time.latestBlock();
      await time.advanceBlock();
      expect(await this.votes.getPastVotes(account1, blockNumber)).to.be.bignumber.equal(this.account1Votes);
      expect(await this.votes.getPastVotes(account2, blockNumber)).to.be.bignumber.equal(this.account2Votes);
    });
  });

  describe('Voting workflow', function () {
    beforeEach(async function () {
      this.name = name;
    });

    shouldBehaveLikeVotes(accounts, tokens, false);
  });
});