openzeppelin-contracts/test/utils/ReentrancyGuard.test.js

const shouldFail = require('../helpers/shouldFail');
const ReentrancyMock = artifacts.require('ReentrancyMock');
const ReentrancyAttack = artifacts.require('ReentrancyAttack');

require('../helpers/setup');

contract('ReentrancyGuard', function () {
  beforeEach(async function () {
    this.reentrancyMock = await ReentrancyMock.new();
    (await this.reentrancyMock.counter()).should.be.bignumber.equal(0);
  });

  it('should not allow remote callback', async function () {
    const attacker = await ReentrancyAttack.new();
    await shouldFail.reverting(this.reentrancyMock.countAndCall(attacker.address));
  });

  // The following are more side-effects than intended behavior:
  // I put them here as documentation, and to monitor any changes
  // in the side-effects.

  it('should not allow local recursion', async function () {
    await shouldFail.reverting(this.reentrancyMock.countLocalRecursive(10));
  });

  it('should not allow indirect local recursion', async function () {
    await shouldFail.reverting(this.reentrancyMock.countThisRecursive(10));
  });
});