text: const { BN, ether, expectEvent, shouldFail, time } = require('openzeppelin-test-helpers');
  
  const TimedCrowdsaleImpl = artifacts.require('TimedCrowdsaleImpl');
  const SimpleToken = artifacts.require('SimpleToken');
  
  contract('TimedCrowdsale', function ([_, investor, wallet, purchaser]) {
    const rate = new BN(1);
    const value = ether('42');
    const tokenSupply = new BN('10').pow(new BN('22'));
  
    before(async function () {
      // Advance to the next block to correctly read time in the solidity "now" function interpreted by ganache
      await time.advanceBlock();
    });
  
    beforeEach(async function () {
      this.openingTime = (await time.latest()).add(time.duration.weeks(1));
      this.closingTime = this.openingTime.add(time.duration.weeks(1));
      this.afterClosingTime = this.closingTime.add(time.duration.seconds(1));
      this.token = await SimpleToken.new();
    });
  
    it('reverts if the opening time is in the past', async function () {
      await shouldFail.reverting(TimedCrowdsaleImpl.new(
        (await time.latest()).sub(time.duration.days(1)), this.closingTime, rate, wallet, this.token.address
      ));
    });
  
    it('reverts if the closing time is before the opening time', async function () {
      await shouldFail.reverting(TimedCrowdsaleImpl.new(
        this.openingTime, this.openingTime.sub(time.duration.seconds(1)), rate, wallet, this.token.address
      ));
    });
  
    it('reverts if the closing time equals the opening time', async function () {
      await shouldFail.reverting(TimedCrowdsaleImpl.new(
        this.openingTime, this.openingTime, rate, wallet, this.token.address
      ));
    });
  
    context('with crowdsale', function () {
      beforeEach(async function () {
        this.crowdsale = await TimedCrowdsaleImpl.new(
          this.openingTime, this.closingTime, rate, wallet, this.token.address
        );
        await this.token.transfer(this.crowdsale.address, tokenSupply);
      });
  
      it('should be ended only after end', async function () {
        (await this.crowdsale.hasClosed()).should.equal(false);
        await time.increaseTo(this.afterClosingTime);
        (await this.crowdsale.isOpen()).should.equal(false);
        (await this.crowdsale.hasClosed()).should.equal(true);
      });
  
      describe('accepting payments', function () {
        it('should reject payments before start', async function () {
          (await this.crowdsale.isOpen()).should.equal(false);
          await shouldFail.reverting(this.crowdsale.send(value));
          await shouldFail.reverting(this.crowdsale.buyTokens(investor, { from: purchaser, value: value }));
        });
  
        it('should accept payments after start', async function () {
          await time.increaseTo(this.openingTime);
          (await this.crowdsale.isOpen()).should.equal(true);
          await this.crowdsale.send(value);
          await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
        });
  
        it('should reject payments after end', async function () {
          await time.increaseTo(this.afterClosingTime);
          await shouldFail.reverting(this.crowdsale.send(value));
          await shouldFail.reverting(this.crowdsale.buyTokens(investor, { value: value, from: purchaser }));
        });
      });
  
      describe('extending closing time', function () {
        it('should not reduce duration', async function () {
          // Same date
          await shouldFail.reverting(this.crowdsale.extendTime(this.closingTime));
  
          // Prescending date
          const newClosingTime = this.closingTime.sub(time.duration.seconds(1));
          await shouldFail.reverting(this.crowdsale.extendTime(newClosingTime));
        });
  
        context('before crowdsale start', function () {
          beforeEach(async function () {
            (await this.crowdsale.isOpen()).should.equal(false);
            await shouldFail.reverting(this.crowdsale.send(value));
          });
  
          it('it extends end time', async function () {
            const newClosingTime = this.closingTime.add(time.duration.days(1));
            const { logs } = await this.crowdsale.extendTime(newClosingTime);
            expectEvent.inLogs(logs, 'TimedCrowdsaleExtended', {
              prevClosingTime: this.closingTime,
              newClosingTime: newClosingTime,
            });
            (await this.crowdsale.closingTime()).should.be.bignumber.equal(newClosingTime);
          });
        });
  
        context('after crowdsale start', function () {
          beforeEach(async function () {
            await time.increaseTo(this.openingTime);
            (await this.crowdsale.isOpen()).should.equal(true);
            await this.crowdsale.send(value);
          });
  
          it('it extends end time', async function () {
            const newClosingTime = this.closingTime.add(time.duration.days(1));
            const { logs } = await this.crowdsale.extendTime(newClosingTime);
            expectEvent.inLogs(logs, 'TimedCrowdsaleExtended', {
              prevClosingTime: this.closingTime,
              newClosingTime: newClosingTime,
            });
            (await this.crowdsale.closingTime()).should.be.bignumber.equal(newClosingTime);
          });
        });
  
        context('after crowdsale end', function () {
          beforeEach(async function () {
            await time.increaseTo(this.afterClosingTime);
          });
  
          it('it reverts', async function () {
            const newClosingTime = await time.latest();
            await shouldFail.reverting(this.crowdsale.extendTime(newClosingTime));
          });
        });
      });
    });
  });
  