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