Fundamental Vue is tested using Chai, Jest and Vue Test Utils.

Tests are executed by running:

$ yarn test

By running

yarn test:watch

you make Jest continuously execute tests. This is great when you prefer test driven development.

yarn test will execute tests matching the pattern: src/**/__tests__/*.test.{ts,js,vue}. In order to create a test make sure that your test is in a directory called __tests__ and has a matching extension.

A simple component test might look something like this:

import { expect } from 'chai';
import { shallowMount } from '@vue/test-utils';
import Button from '../Button.vue';
describe('Button', () => {
  it('renders default slot when passed', () => {
    const title = 'Button Title';
    const wrapper = shallowMount(Button, {
      slots: {
        default: title,
      },
    });
    expect(wrapper.text()).to.include(title);
  });
});

Consider the following guidelines when writing new tests:

• Test the core (e.g.: stateless algorithms, utility functions, helper classes) first: Testing those kind of things usually has the highest payoff: Easy to write and heavily used.
• Each non-trivial component should have at least one test. Using Vue Test Utils is a good idea.
• Component tests should be general and not test implementation details. Again: Using Vue Test Utils helps to accomplish that goal.

There are not a lot of tests at the time of writing. Fundamental Vue started as a hobby project and thus testing wasn't on the top of the list early on.

Pretty soon new code will require a certain test coverage. We will also add tests for existing components/code over the next couple of weeks. The Boy Scout Rule

Leave your code better than you found it.

will be enforced at some point in the near future.