text: const { BN } = require('openzeppelin-test-helpers');
  
  const CounterImpl = artifacts.require('CounterImpl');
  
  const EXPECTED = [new BN(1), new BN(2), new BN(3), new BN(4)];
  const KEY1 = web3.utils.sha3('key1');
  const KEY2 = web3.utils.sha3('key2');
  
  contract('Counter', function ([_, owner]) {
    beforeEach(async function () {
      this.mock = await CounterImpl.new({ from: owner });
    });
  
    context('custom key', async function () {
      it('should return expected values', async function () {
        for (const expectedId of EXPECTED) {
          await this.mock.doThing(KEY1, { from: owner });
          const actualId = await this.mock.theId();
          actualId.should.be.bignumber.equal(expectedId);
        }
      });
    });
  
    context('parallel keys', async function () {
      it('should return expected values for each counter', async function () {
        for (const expectedId of EXPECTED) {
          await this.mock.doThing(KEY1, { from: owner });
          let actualId = await this.mock.theId();
          actualId.should.be.bignumber.equal(expectedId);
  
          await this.mock.doThing(KEY2, { from: owner });
          actualId = await this.mock.theId();
          actualId.should.be.bignumber.equal(expectedId);
        }
      });
    });
  });
  