Migrate spec/javascripts/diffs to Jest

Only mock files remained, so those can be deleted.

spec/frontend/diffs/components/diff_content_spec.js

@@ -10,7 +10,7 @@ import ImageDiffOverlay from '~/diffs/components/image_diff_overlay.vue';
 import NoteForm from '~/notes/components/note_form.vue';
 import DiffDiscussions from '~/diffs/components/diff_discussions.vue';
 import { IMAGE_DIFF_POSITION_TYPE } from '~/diffs/constants';
-import diffFileMockData from '../../../javascripts/diffs/mock_data/diff_file';
+import diffFileMockData from '../mock_data/diff_file';
 import { diffViewerModes } from '~/ide/constants';
 
 const localVue = createLocalVue();

spec/javascripts/diffs/create_diffs_store.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-export { default } from '../../frontend/diffs/create_diffs_store';

spec/javascripts/diffs/mock_data/diff_discussions.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-export { default } from '../../../frontend/diffs/mock_data/diff_discussions';

spec/javascripts/diffs/mock_data/diff_file.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-export { default } from '../../../frontend/diffs/mock_data/diff_file';

spec/javascripts/diffs/mock_data/diff_file_unreadable.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-export { default } from '../../../frontend/diffs/mock_data/diff_file_unreadable';

spec/javascripts/diffs/mock_data/diff_with_commit.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-import getDiffWithCommit from '../../../frontend/diffs/mock_data/diff_with_commit';
-
-export default getDiffWithCommit;

spec/javascripts/diffs/mock_data/merge_request_diffs.js

-// No new code should be added to this file. Instead, modify the
-// file this one re-exports from. For more detail about why, see:
-// https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/31349
-
-import diffsMockData from '../../../frontend/diffs/mock_data/merge_request_diffs';
-
-export default diffsMockData;

spec/javascripts/helpers/init_vue_mr_page_helper.js

@@ -2,7 +2,7 @@ import MockAdapter from 'axios-mock-adapter';
 import initMRPage from '~/mr_notes/index';
 import axios from '~/lib/utils/axios_utils';
 import { userDataMock, notesDataMock, noteableDataMock } from '../../frontend/notes/mock_data';
-import diffFileMockData from '../diffs/mock_data/diff_file';
+import diffFileMockData from '../../frontend/diffs/mock_data/diff_file';
 
 export default function initVueMRPage() {
   const mrTestEl = document.createElement('div');