59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
const { expectRevert } = require('openzeppelin-test-helpers');
|
|
|
|
const CountersImpl = artifacts.require('CountersImpl');
|
|
|
|
contract('Counters', function () {
|
|
beforeEach(async function () {
|
|
this.counter = await CountersImpl.new();
|
|
});
|
|
|
|
it('starts at zero', async function () {
|
|
(await this.counter.current()).should.be.bignumber.equal('0');
|
|
});
|
|
|
|
describe('increment', function () {
|
|
it('increments the current value by one', async function () {
|
|
await this.counter.increment();
|
|
(await this.counter.current()).should.be.bignumber.equal('1');
|
|
});
|
|
|
|
it('can be called multiple times', async function () {
|
|
await this.counter.increment();
|
|
await this.counter.increment();
|
|
await this.counter.increment();
|
|
|
|
(await this.counter.current()).should.be.bignumber.equal('3');
|
|
});
|
|
});
|
|
|
|
describe('decrement', function () {
|
|
beforeEach(async function () {
|
|
await this.counter.increment();
|
|
(await this.counter.current()).should.be.bignumber.equal('1');
|
|
});
|
|
|
|
it('decrements the current value by one', async function () {
|
|
await this.counter.decrement();
|
|
(await this.counter.current()).should.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');
|
|
});
|
|
|
|
it('can be called multiple times', async function () {
|
|
await this.counter.increment();
|
|
await this.counter.increment();
|
|
|
|
(await this.counter.current()).should.be.bignumber.equal('3');
|
|
|
|
await this.counter.decrement();
|
|
await this.counter.decrement();
|
|
await this.counter.decrement();
|
|
|
|
(await this.counter.current()).should.be.bignumber.equal('0');
|
|
});
|
|
});
|
|
});
|