111 lines
3.5 KiB
JavaScript
111 lines
3.5 KiB
JavaScript
const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
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const { ZERO_ADDRESS } = constants;
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const { expect } = require('chai');
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function shouldBehaveLikeERC20Burnable (owner, initialBalance, [burner]) {
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describe('burn', function () {
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describe('when the given amount is not greater than balance of the sender', function () {
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context('for a zero amount', function () {
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shouldBurn(new BN(0));
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});
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context('for a non-zero amount', function () {
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shouldBurn(new BN(100));
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});
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function shouldBurn (amount) {
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beforeEach(async function () {
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({ logs: this.logs } = await this.token.burn(amount, { from: owner }));
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});
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it('burns the requested amount', async function () {
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expect(await this.token.balanceOf(owner)).to.be.bignumber.equal(initialBalance.sub(amount));
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});
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it('emits a transfer event', async function () {
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expectEvent.inLogs(this.logs, 'Transfer', {
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from: owner,
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to: ZERO_ADDRESS,
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value: amount,
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});
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});
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}
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});
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describe('when the given amount is greater than the balance of the sender', function () {
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const amount = initialBalance.addn(1);
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it('reverts', async function () {
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await expectRevert(this.token.burn(amount, { from: owner }),
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'ERC20: burn amount exceeds balance'
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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('on success', function () {
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context('for a zero amount', function () {
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shouldBurnFrom(new BN(0));
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});
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context('for a non-zero amount', function () {
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shouldBurnFrom(new BN(100));
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});
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function shouldBurnFrom (amount) {
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const originalAllowance = amount.muln(3);
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beforeEach(async function () {
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await this.token.approve(burner, originalAllowance, { from: owner });
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const { logs } = await this.token.burnFrom(owner, amount, { from: burner });
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this.logs = logs;
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});
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it('burns the requested amount', async function () {
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expect(await this.token.balanceOf(owner)).to.be.bignumber.equal(initialBalance.sub(amount));
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});
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it('decrements allowance', async function () {
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expect(await this.token.allowance(owner, burner)).to.be.bignumber.equal(originalAllowance.sub(amount));
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});
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it('emits a transfer event', async function () {
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expectEvent.inLogs(this.logs, 'Transfer', {
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from: owner,
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to: ZERO_ADDRESS,
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value: amount,
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});
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});
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}
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});
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describe('when the given amount is greater than the balance of the sender', function () {
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const amount = initialBalance.addn(1);
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it('reverts', async function () {
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await this.token.approve(burner, amount, { from: owner });
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await expectRevert(this.token.burnFrom(owner, amount, { from: burner }),
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'ERC20: burn amount exceeds balance'
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);
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});
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});
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describe('when the given amount is greater than the allowance', function () {
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const allowance = new BN(100);
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it('reverts', async function () {
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await this.token.approve(burner, allowance, { from: owner });
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await expectRevert(this.token.burnFrom(owner, allowance.addn(1), { from: burner }),
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'ERC20: burn amount exceeds allowance'
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);
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});
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});
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});
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}
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module.exports = {
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shouldBehaveLikeERC20Burnable,
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};
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