text: const { BN, constants, expectEvent, expectRevert } = require('@payprime/test-helpers');
  const { ZERO_ADDRESS } = constants;
  
  const { expect } = require('chai');
  
  const ERC20PresetMinterPauser = artifacts.require('ERC20PresetMinterPauser');
  
  contract('ERC20PresetMinterPauser', function (accounts) {
    const [ deployer, other ] = accounts;
  
    const name = 'MinterPauserToken';
    const symbol = 'DRT';
  
    const amount = new BN('5000');
  
    const DEFAULT_ADMIN_ROLE = '0x0000000000000000000000000000000000000000000000000000000000000000';
    const MINTER_ROLE = web3.utils.soliditySha3('MINTER_ROLE');
    const PAUSER_ROLE = web3.utils.soliditySha3('PAUSER_ROLE');
  
    beforeEach(async function () {
      this.token = await ERC20PresetMinterPauser.new(name, symbol, { from: deployer });
    });
  
    it('deployer has the default admin role', async function () {
      expect(await this.token.getRoleMemberCount(DEFAULT_ADMIN_ROLE)).to.be.bignumber.equal('1');
      expect(await this.token.getRoleMember(DEFAULT_ADMIN_ROLE, 0)).to.equal(deployer);
    });
  
    it('deployer has the minter role', async function () {
      expect(await this.token.getRoleMemberCount(MINTER_ROLE)).to.be.bignumber.equal('1');
      expect(await this.token.getRoleMember(MINTER_ROLE, 0)).to.equal(deployer);
    });
  
    it('deployer has the pauser role', async function () {
      expect(await this.token.getRoleMemberCount(PAUSER_ROLE)).to.be.bignumber.equal('1');
      expect(await this.token.getRoleMember(PAUSER_ROLE, 0)).to.equal(deployer);
    });
  
    it('minter and pauser role admin is the default admin', async function () {
      expect(await this.token.getRoleAdmin(MINTER_ROLE)).to.equal(DEFAULT_ADMIN_ROLE);
      expect(await this.token.getRoleAdmin(PAUSER_ROLE)).to.equal(DEFAULT_ADMIN_ROLE);
    });
  
    describe('minting', function () {
      it('deployer can mint tokens', async function () {
        const receipt = await this.token.mint(other, amount, { from: deployer });
        expectEvent(receipt, 'Transfer', { from: ZERO_ADDRESS, to: other, value: amount });
  
        expect(await this.token.balanceOf(other)).to.be.bignumber.equal(amount);
      });
  
      it('other accounts cannot mint tokens', async function () {
        await expectRevert(
          this.token.mint(other, amount, { from: other }),
          'ERC20PresetMinterPauser: must have minter role to mint',
        );
      });
    });
  
    describe('pausing', function () {
      it('deployer can pause', async function () {
        const receipt = await this.token.pause({ from: deployer });
        expectEvent(receipt, 'Paused', { account: deployer });
  
        expect(await this.token.paused()).to.equal(true);
      });
  
      it('deployer can unpause', async function () {
        await this.token.pause({ from: deployer });
  
        const receipt = await this.token.unpause({ from: deployer });
        expectEvent(receipt, 'Unpaused', { account: deployer });
  
        expect(await this.token.paused()).to.equal(false);
      });
  
      it('cannot mint while paused', async function () {
        await this.token.pause({ from: deployer });
  
        await expectRevert(
          this.token.mint(other, amount, { from: deployer }),
          'ERC20Pausable: token transfer while paused',
        );
      });
  
      it('other accounts cannot pause', async function () {
        await expectRevert(
          this.token.pause({ from: other }),
          'ERC20PresetMinterPauser: must have pauser role to pause',
        );
      });
  
      it('other accounts cannot unpause', async function () {
        await this.token.pause({ from: deployer });
  
        await expectRevert(
          this.token.unpause({ from: other }),
          'ERC20PresetMinterPauser: must have pauser role to unpause',
        );
      });
    });
  
    describe('burning', function () {
      it('holders can burn their tokens', async function () {
        await this.token.mint(other, amount, { from: deployer });
  
        const receipt = await this.token.burn(amount.subn(1), { from: other });
        expectEvent(receipt, 'Transfer', { from: other, to: ZERO_ADDRESS, value: amount.subn(1) });
  
        expect(await this.token.balanceOf(other)).to.be.bignumber.equal('1');
      });
    });
  });
  