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const { expectRevert, time } = require('@openzeppelin/test-helpers');
const { expect } = require('chai');
const { batchInBlock } = require('../helpers/txpool');
const CheckpointsImpl = artifacts.require('CheckpointsImpl');
contract('Checkpoints', function (accounts) {
beforeEach(async function () {
this.checkpoint = await CheckpointsImpl.new();
});
describe('without checkpoints', function () {
it('returns zero as latest value', async function () {
expect(await this.checkpoint.latest()).to.be.bignumber.equal('0');
});
it('returns zero as past value', async function () {
await time.advanceBlock();
expect(await this.checkpoint.getAtBlock(await web3.eth.getBlockNumber() - 1)).to.be.bignumber.equal('0');
});
});
describe('with checkpoints', function () {
beforeEach('pushing checkpoints', async function () {
this.tx1 = await this.checkpoint.push(1);
this.tx2 = await this.checkpoint.push(2);
await time.advanceBlock();
this.tx3 = await this.checkpoint.push(3);
await time.advanceBlock();
await time.advanceBlock();
});
it('returns latest value', async function () {
expect(await this.checkpoint.latest()).to.be.bignumber.equal('3');
});
it('returns past values', async function () {
expect(await this.checkpoint.getAtBlock(this.tx1.receipt.blockNumber - 1)).to.be.bignumber.equal('0');
expect(await this.checkpoint.getAtBlock(this.tx1.receipt.blockNumber)).to.be.bignumber.equal('1');
expect(await this.checkpoint.getAtBlock(this.tx2.receipt.blockNumber)).to.be.bignumber.equal('2');
// Block with no new checkpoints
expect(await this.checkpoint.getAtBlock(this.tx2.receipt.blockNumber + 1)).to.be.bignumber.equal('2');
expect(await this.checkpoint.getAtBlock(this.tx3.receipt.blockNumber)).to.be.bignumber.equal('3');
expect(await this.checkpoint.getAtBlock(this.tx3.receipt.blockNumber + 1)).to.be.bignumber.equal('3');
});
it('reverts if block number >= current block', async function () {
await expectRevert(
this.checkpoint.getAtBlock(await web3.eth.getBlockNumber()),
'Checkpoints: block not yet mined',
);
await expectRevert(
this.checkpoint.getAtBlock(await web3.eth.getBlockNumber() + 1),
'Checkpoints: block not yet mined',
);
});
it('multiple checkpoints in the same block', async function () {
const lengthBefore = await this.checkpoint.length();
await batchInBlock([
() => this.checkpoint.push(8, { gas: 100000 }),
() => this.checkpoint.push(9, { gas: 100000 }),
() => this.checkpoint.push(10, { gas: 100000 }),
]);
const lengthAfter = await this.checkpoint.length();
expect(lengthAfter.toNumber()).to.be.equal(lengthBefore.toNumber() + 1);
expect(await this.checkpoint.latest()).to.be.bignumber.equal('10');
});
});
});