Find the Vue.js 2 version .
Not directly related to Vue testing, more specific to Jest. Jest is used heavily throughout this handbook, though, and becoming widely adopted in the industry, so I think it deserves a section.
- Reference the sections of the existing guide using Jest
- Manual mocks
- automatic mock
Ref: https://jestjs.io/docs/en/es6-class-mocks#the-4-ways-to-create-an-es6-class-mock