import { expect } from 'chai';

describe('smoke test', () => {
  it('run a test', () => {
    expect(true).to.equal(true);
  });
});

import { expect } from 'chai';

describe('smoke test', () => {
  it('run a test', () => {
    expect(true).to.equal(false);
  });
});

Make the fail the test to demo CircleCI