openzeppelin-contracts/test/payment/PullPayment.test.js

const { accounts, contract } = require('@openzeppelin/test-environment');

const { balance, ether } = require('@openzeppelin/test-helpers');

const { expect } = require('chai');

const PullPaymentMock = contract.fromArtifact('PullPaymentMock');

describe('PullPayment', function () {
  const [ payer, payee1, payee2 ] = accounts;

  const amount = ether('17');

  beforeEach(async function () {
    this.contract = await PullPaymentMock.new({ value: amount });
  });

  it('can record an async payment correctly', async function () {
    await this.contract.callTransfer(payee1, 100, { from: payer });
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal('100');
  });

  it('can add multiple balances on one account', async function () {
    await this.contract.callTransfer(payee1, 200, { from: payer });
    await this.contract.callTransfer(payee1, 300, { from: payer });
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal('500');
  });

  it('can add balances on multiple accounts', async function () {
    await this.contract.callTransfer(payee1, 200, { from: payer });
    await this.contract.callTransfer(payee2, 300, { from: payer });

    expect(await this.contract.payments(payee1)).to.be.bignumber.equal('200');

    expect(await this.contract.payments(payee2)).to.be.bignumber.equal('300');
  });

  it('can withdraw payment', async function () {
    const balanceTracker = await balance.tracker(payee1);

    await this.contract.callTransfer(payee1, amount, { from: payer });
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal(amount);

    await this.contract.withdrawPayments(payee1);

    expect(await balanceTracker.delta()).to.be.bignumber.equal(amount);
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal('0');
  });

  it('can withdraw payment forwarding all gas', async function () {
    const balanceTracker = await balance.tracker(payee1);

    await this.contract.callTransfer(payee1, amount, { from: payer });
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal(amount);

    await this.contract.withdrawPaymentsWithGas(payee1);

    expect(await balanceTracker.delta()).to.be.bignumber.equal(amount);
    expect(await this.contract.payments(payee1)).to.be.bignumber.equal('0');
  });
});