const { expect } = require("chai");
const {
  BN,
  constants,
  expectEvent,
  expectRevert,
} = require("@openzeppelin/test-helpers");
const BECoin = artifacts.require("BECoin");

contract("BECoin", ([owner, other]) => {
  const amount = new BN(10000);

  beforeEach(async () => {
    this.coin = await BECoin.new();
  });
  it("should put 20000000 * 1e18 BECoin in the first account", async () => {
    let balance = await this.coin.balanceOf.call(owner);
    assert.equal(
      balance.valueOf(),
      20000000 * 1e18,
      "20000000 * 1e18 wasn't in the first account"
    );
  });

  it("reverts when transferring tokens to the zero address", async () => {
    // Conditions that trigger a require statement can be precisely tested
    await expectRevert(
      this.coin.transfer(constants.ZERO_ADDRESS, amount),
      "ERC20: transfer to the zero address"
    );
  });

  it("should emit Transfer event", async () => {
    const receipt = await this.coin.transfer(other, amount);
    expectEvent(receipt, "Transfer", {
      from: owner,
      to: other,
      value: amount,
    });
  });

  it("should send coin correctly", async () => {
    await this.coin.transfer(other, amount);
    expect(await this.coin.balanceOf(other)).to.be.bignumber.equal(amount);
  });
});