As you always should, you will begin with a templated test file designed to verify that the unit testing framework is configured correctly:

import { expect } from 'chai';
 
describe('Test Framework', () =>  {
  it('is configured correctly', () => {
    expect(1).to.equal(0);
  }
}

We have shown a failing version of this template. Before you begin writing the tests that are actually for the kata, run the test:watch NPM script and verify that the test fails. Also, verify that it fails for the right reason. It should fail because 1 was expected but 0 was the actual result. After the test properly fails, change the zero to a one and verify that the test now passes. As long as these two validations work correctly, we will continue and begin working through the code kata.