(Medium) When Code Duplication In Tests Is Acceptable - Cart Test Example With Abstraction

CartTestExampleWithAbstraction.js

const FakeCloth = {
  any: () => {
    return Product()
    .withSize('XL') // Mandatory
    .withColor('black'); // Mandatory
  }
};

module('Shirts cart');

test('a valid product can be retrieved from the cart after being added', () => {
  const fakeShirt = FakeCloth.any().asType('shirt');
  const cart = ShirtsCart();
  cart.addProduct(fakeShirt);
  expect(cart).toContain(fakeShirt);
});

test('when we try to add an invalid product to the cart then it\'s not added', () => {
  const fakePants = FakeCloth.any().asType('pants');
  const cart = ShirtsCart();
  cart.addProduct(fakePants);
  expect(cart).not.toContain(fakePants);
});