Mock mr_notes store in frontend tests (part 1)
!116292 (closed) was split and this is the first part
copied description:
Mocks
'~/mr_notes/stores
in frontend component tests as documented in https://docs.gitlab.com/ee/development/testing_guide/testing_levels.html#frontend-component-tests:What to mock in component tests
- Vuex store: To avoid side effects and keep component tests simple, Vuex stores are replaced with mocks.
Solves !116180 (comment 1334377978)