text: const { ethGetBalance } = require('../helpers/web3');
  
  const BigNumber = web3.BigNumber;
  
  const should = require('chai')
    .use(require('chai-bignumber')(BigNumber))
    .should();
  
  function shouldBehaveLikeMintedCrowdsale ([_, investor, wallet, purchaser], rate, value) {
    const expectedTokenAmount = rate.mul(value);
  
    describe('as a minted crowdsale', function () {
      describe('accepting payments', function () {
        it('should accept payments', async function () {
          await this.crowdsale.send(value);
          await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
        });
      });
  
      describe('high-level purchase', function () {
        it('should log purchase', async function () {
          const { logs } = await this.crowdsale.sendTransaction({ value: value, from: investor });
          const event = logs.find(e => e.event === 'TokenPurchase');
          should.exist(event);
          event.args.purchaser.should.equal(investor);
          event.args.beneficiary.should.equal(investor);
          event.args.value.should.be.bignumber.equal(value);
          event.args.amount.should.be.bignumber.equal(expectedTokenAmount);
        });
  
        it('should assign tokens to sender', async function () {
          await this.crowdsale.sendTransaction({ value: value, from: investor });
          (await this.token.balanceOf(investor)).should.be.bignumber.equal(expectedTokenAmount);
        });
  
        it('should forward funds to wallet', async function () {
          const pre = await ethGetBalance(wallet);
          await this.crowdsale.sendTransaction({ value, from: investor });
          const post = await ethGetBalance(wallet);
          post.minus(pre).should.be.bignumber.equal(value);
        });
      });
    });
  }
  
  module.exports = {
    shouldBehaveLikeMintedCrowdsale,
  };
  