React.js - Simulating a click with Enzyme

Question

I have this React.js app that is a simple Cart app. https://codesandbox.io/s/znvk4p70xl

The problem is I am trying to unit test the state of the application using Jest and Enzyme but it does not seem to work. Here is my Todo.test.js unit test:

import React from 'react';
import { shallow, mount, render } from 'enzyme';
import Todo from '../components/Todo';

import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

test('Test it', async () => {
  // Render a checkbox with label in the document
  const cart = [
    { name: 'Green', cost: 4 },
    { name: 'Red', cost: 8 },
    { name: 'Blue', cost: 14 }
  ];

  const wrapper = mount(<Todo cart={cart} />);
  const firstInput = wrapper.find('.name');
  firstInput.simulate('change', { target: { value: 'Pink' } });

  const firstCost = wrapper.find('.cost');
  firstCost.simulate('change', { target: { value: 200 } });

  const submitButton = wrapper.find('.addtocart');
  submitButton.simulate('click');

  wrapper.update();

  expect(wrapper.state('price')).toBe(26);

  console.log(wrapper.state());
  console.log(wrapper.props().cart);

});

When I run the test, the cart still says the same thing when the item Pink should have been added.

How can this be when I have simulated a button click on the addToCart method?

 PASS  src/__tests__/todo.test.js
  ● Console
    console.log src/__tests__/todo.test.js:32      { price: 26 }    
console.log src/__tests__/todo.test.js:33      [ { name: 'Green', cost: 4 },        { name: 'Red', cost: 8 },        { name: 'Blue', cost: 14 } ]

Elliot B. Elliot B. · Accepted Answer · 2018-05-08T01:10:01

You are attempting to simulate a click on an element with class addtocart. However, you don't have an element with class addtocart. Your add button has an element ID of submit.

Change this:

const submitButton = wrapper.find('.addtocart');

To this:

const submitButton = wrapper.find('#submit');

React.js - Simulating a click with Enzyme

3 Answers