test(Refactored notes tests from Karma to Jest):

fix #58829

Added changelog entry

Added merge request id

changelogs/unreleased/refactor-58829-migrate-notes-spec-to-jest.yml

+---
+title: 'Refactored notes tests from Karma to Jest'
+merge_request: 27648
+author: Martin Hobert
+type: other

spec/javascripts/vue_shared/components/notes/placeholder_note_spec.js → spec/frontend/vue_shared/components/notes/placeholder_note_spec.js

 import Vue from 'vue';
 import issuePlaceholderNote from '~/vue_shared/components/notes/placeholder_note.vue';
 import createStore from '~/notes/stores';
-import { userDataMock } from '../../../notes/mock_data';
+import { userDataMock } from '../../../../javascripts/notes/mock_data';
 
 describe('issue placeholder system note component', () => {
   let store;

spec/javascripts/vue_shared/components/notes/placeholder_system_note_spec.js → spec/frontend/vue_shared/components/notes/placeholder_system_note_spec.js

 import Vue from 'vue';
 import placeholderSystemNote from '~/vue_shared/components/notes/placeholder_system_note.vue';
-import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import mountComponent from 'helpers/vue_mount_component_helper';
 
 describe('placeholder system note component', () => {
   let PlaceholderSystemNote;