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84 lines
2.7 KiB
84 lines
2.7 KiB
const { expectRevert } = require('@openzeppelin/test-helpers');
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const { expect } = require('chai');
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const CountersImpl = artifacts.require('CountersImpl');
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contract('Counters', function (accounts) {
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beforeEach(async function () {
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this.counter = await CountersImpl.new();
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});
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it('starts at zero', async function () {
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expect(await this.counter.current()).to.be.bignumber.equal('0');
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});
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describe('increment', function () {
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context('starting from 0', function () {
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it('increments the current value by one', async function () {
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await this.counter.increment();
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expect(await this.counter.current()).to.be.bignumber.equal('1');
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});
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it('can be called multiple times', async function () {
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await this.counter.increment();
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await this.counter.increment();
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await this.counter.increment();
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expect(await this.counter.current()).to.be.bignumber.equal('3');
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});
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});
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});
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describe('decrement', function () {
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beforeEach(async function () {
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await this.counter.increment();
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expect(await this.counter.current()).to.be.bignumber.equal('1');
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});
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context('starting from 1', function () {
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it('decrements the current value by one', async function () {
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await this.counter.decrement();
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expect(await this.counter.current()).to.be.bignumber.equal('0');
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});
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it('reverts if the current value is 0', async function () {
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await this.counter.decrement();
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await expectRevert(this.counter.decrement(), 'Counter: decrement overflow');
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});
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});
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context('after incremented to 3', function () {
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it('can be called multiple times', async function () {
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await this.counter.increment();
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await this.counter.increment();
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expect(await this.counter.current()).to.be.bignumber.equal('3');
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await this.counter.decrement();
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await this.counter.decrement();
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await this.counter.decrement();
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expect(await this.counter.current()).to.be.bignumber.equal('0');
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});
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});
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});
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describe('reset', function () {
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context('null counter', function () {
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it('does not throw', async function () {
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await this.counter.reset();
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expect(await this.counter.current()).to.be.bignumber.equal('0');
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});
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});
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context('non null counter', function () {
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beforeEach(async function () {
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await this.counter.increment();
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expect(await this.counter.current()).to.be.bignumber.equal('1');
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});
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it('reset to 0', async function () {
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await this.counter.reset();
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expect(await this.counter.current()).to.be.bignumber.equal('0');
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});
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});
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});
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});
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