66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
const { contract } = require('@openzeppelin/test-environment');
|
|
const { expectRevert } = require('@openzeppelin/test-helpers');
|
|
|
|
const { expect } = require('chai');
|
|
|
|
const CountersImpl = contract.fromArtifact('CountersImpl');
|
|
|
|
describe('Counters', function () {
|
|
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(), 'SafeMath: subtraction 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');
|
|
});
|
|
});
|
|
});
|
|
});
|