1 - sudo vue add @vue/unit-jest
2 - Clear Jest cache. You can find the cache location by running `jest --showConfig`. Look for `cacheDirectory` key. Its value is the name of the folder you'll need to remove.
3 - Create test files into project_name/tests/unit/. file must have this structure name.spec.js for example /home/pablo/projects/lumbre/lumbre-vue-admin/tests/unit/LmPagination.spec.js
4 - In the terminal yarn test:unit