Snapshot testing

Snapshot tests provide a way to write tests for fast-changing pieces of code without keeping the assertion data inline with the test. Changes to a snapshot reflect changes to the output, which is quite useful for code reviews.

For example, we can add a snapshot test to the PostList.test.js file:

  it('PostList renders correctly', () => {
    const wrapper = mount(PostList, {
      propsData: {
        posts: [
               {
                 title: "Title 1",
                 description: "Description 1"
              ...