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105 lines
3.6 KiB
105 lines
3.6 KiB
const { ethers } = require('hardhat');
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const { expect } = require('chai');
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const { loadFixture } = require('@nomicfoundation/hardhat-network-helpers');
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const name = 'My Token';
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const symbol = 'MTKN';
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const initialBalance = 1000n;
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async function fixture() {
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const [owner, burner] = await ethers.getSigners();
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const token = await ethers.deployContract('$ERC20Burnable', [name, symbol], owner);
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await token.$_mint(owner, initialBalance);
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return { owner, burner, token, initialBalance };
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}
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describe('ERC20Burnable', function () {
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beforeEach(async function () {
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Object.assign(this, await loadFixture(fixture));
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});
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describe('burn', function () {
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it('reverts if not enough balance', async function () {
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const value = this.initialBalance + 1n;
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await expect(this.token.connect(this.owner).burn(value))
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.to.be.revertedWithCustomError(this.token, 'ERC20InsufficientBalance')
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.withArgs(this.owner, this.initialBalance, value);
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});
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describe('on success', function () {
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for (const { title, value } of [
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{ title: 'for a zero value', value: 0n },
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{ title: 'for a non-zero value', value: 100n },
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]) {
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describe(title, function () {
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beforeEach(async function () {
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this.tx = await this.token.connect(this.owner).burn(value);
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});
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it('burns the requested value', async function () {
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await expect(this.tx).to.changeTokenBalance(this.token, this.owner, -value);
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});
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it('emits a transfer event', async function () {
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await expect(this.tx).to.emit(this.token, 'Transfer').withArgs(this.owner, ethers.ZeroAddress, value);
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});
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});
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}
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});
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});
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describe('burnFrom', function () {
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describe('reverts', function () {
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it('if not enough balance', async function () {
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const value = this.initialBalance + 1n;
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await this.token.connect(this.owner).approve(this.burner, value);
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await expect(this.token.connect(this.burner).burnFrom(this.owner, value))
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.to.be.revertedWithCustomError(this.token, 'ERC20InsufficientBalance')
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.withArgs(this.owner, this.initialBalance, value);
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});
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it('if not enough allowance', async function () {
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const allowance = 100n;
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await this.token.connect(this.owner).approve(this.burner, allowance);
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await expect(this.token.connect(this.burner).burnFrom(this.owner, allowance + 1n))
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.to.be.revertedWithCustomError(this.token, 'ERC20InsufficientAllowance')
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.withArgs(this.burner, allowance, allowance + 1n);
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});
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});
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describe('on success', function () {
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for (const { title, value } of [
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{ title: 'for a zero value', value: 0n },
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{ title: 'for a non-zero value', value: 100n },
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]) {
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describe(title, function () {
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const originalAllowance = value * 3n;
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beforeEach(async function () {
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await this.token.connect(this.owner).approve(this.burner, originalAllowance);
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this.tx = await this.token.connect(this.burner).burnFrom(this.owner, value);
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});
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it('burns the requested value', async function () {
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await expect(this.tx).to.changeTokenBalance(this.token, this.owner, -value);
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});
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it('decrements allowance', async function () {
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expect(await this.token.allowance(this.owner, this.burner)).to.equal(originalAllowance - value);
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});
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it('emits a transfer event', async function () {
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await expect(this.tx).to.emit(this.token, 'Transfer').withArgs(this.owner, ethers.ZeroAddress, value);
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});
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});
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}
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});
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});
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});
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