text: import * as moodSelectors from './moodSelectors';
  
  test('cartesianProduct', () => {
    const options = [];
    options.push(['big', 'small']);
    options.push(['red', 'blue']);
    expect(moodSelectors.cartesianProduct(options)).toBe([["big", "red"], ["big", "blue"], ["small", "red"], ["small", "blue"]]);
  });
  